[Bug]: HEIC file previews not showing or generating after update to 34.0.5

Start by comparing the container image and preview related changes between Nextcloud 34.0.4 and 34.0.5; the issue gives no repository file or failing test to begin from. Reproduce with a HEIC image using the reported Debian/Ubuntu, PHP 8.5, and Nginx setup, then trace preview generation in the image. Done means existing HEIC previews display and new ones generate after the update.

⚠️ This issue respects the following points: ⚠️

• This is not a troubleshooting question, general support matter, or webserver/proxy problem, but likely a bug (if unsure, ask the Community Help Forum).
• This issue is not already reported on Github OR solved at the Community Help Forum (I've searched!).
• I'm using a maintained major version of Nextcloud Server and tested against the latest patch level. (Supported major versions and current patch levels).
• I agree to follow Nextcloud's Code of Conduct.
• I've tried my best to provide clear reproduction steps that someone unfamiliar with this bug could use to reproduce it.

Bug description

Updated from 34.0.4 to 34.0.5 last night and all my HEIC previews are refusing to show. These were existing previews that were already pre-generated. New ones don't generate either.

Steps to reproduce

1. Open NC and look at HEIC images in any app that uses previews (Files, Photos, Memories, etc.)
2. Observe that preview is gone/missing.

Expected behavior

Previews should (and were) showing

Nextcloud Server version

34

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.5

Web server

Nginx

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Updated from a MINOR version (ex. 32.0.1 to 32.0.2)

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": true
            }
        ],
        "upgrade.disable-web": true,
        "defaultapp": "memories",
        "loglevel": 2,
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "forwarded_for_headers": [
            "HTTP_X_REAL_IP",
            "HTTP_X_FORWARDED_FOR"
        ],
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "password": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "filelocking.enabled": true,
        "trusted_domains": [
            "localhost",
            "127.0.0.1",
            "nextcloud.REDACTED.com"
        ],
        "default_locale": "en_US",
        "default_phone_region": "US",
        "enable_previews": true,
        "enabledPreviewProviders": [
            "OC\\Preview\\HEIC",
            "OC\\Preview\\MKV",
            "OC\\Preview\\MP4",
            "OC\\Preview\\AVI",
            "OC\\Preview\\Movie",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\BMP",
            "OC\\Preview\\PNG",
            "OC\\Preview\\Image",
            "OC\\Preview\\TIFF"
        ],
        "cropimagepreviews": "0",
        "preview_max_x": 2048,
        "preview_max_y": 2048,
        "jpeg_quality": 60,
        "logtimezone": "America\/New_York",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "version": "34.0.5.1",
        "updater.release.channel": "stable",
        "overwrite.cli.url": "https:\/\/nextcloud.REDACTED.com",
        "overwritehost": "nextcloud.REDACTED.com",
        "overwriteprotocol": "https",
        "dbtype": "mysql",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "ssl",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "maintenance": false,
        "trashbin_retention_obligation": "30,31",
        "theme": "",
        "app_install_overwrite": [
            "customproperties"
        ],
        "data-fingerprint": "cf5cf1b31d5af06404c30a5805d00eda",
        "mail_smtpauth": true,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "maintenance_window_start": 8,
        "files.chunked_upload.max_size": 0,
        "memories.db.triggers.fcu": true,
        "memories.exiftool": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/eperl-amd64-musl",
        "memories.vod.path": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/go-vod-amd64",
        "memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
        "memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
        "memories.gis_type": 1,
        "mail_smtpstreamoptions": {
            "ssl": {
                "allow_self_signed": false,
                "verify_peer": true,
                "verify_peer_name": true
            }
        },
        "memories.video_default_quality": "-2",
        "memories.vod.connect": [
            "go-vod:47788"
        ],
        "memories.vod.bind": "",
        "memories.vod.external": true
    },
    "apps": {
        "activity": {
            "enable_email": "no",
            "enabled": "yes",
            "installed_version": "7.0.0",
            "notify_email_calendar": "0",
            "notify_email_calendar_event": "0",
            "notify_email_calendar_todo": "0",
            "notify_email_favorite": "0",
            "notify_email_file_changed": "0",
            "notify_email_file_favorite_changed": "0",
            "notify_email_public_links": "0",
            "notify_email_remote_share": "0",
            "notify_email_shared": "0",
            "notify_notification_calendar": "0",
            "notify_notification_calendar_event": "0",
            "notify_notification_calendar_todo": "0",
            "notify_notification_favorite": "0",
            "notify_notification_file_changed": "0",
            "notify_notification_file_favorite_changed": "0",
            "notify_notification_group_settings": "1",
            "notify_notification_personal_settings": "1",
            "notify_notification_public_links": "0",
            "notify_notification_remote_share": "0",
            "notify_notification_security": "1",
            "notify_notification_shared": "0",
            "notify_notification_twofactor_totp": "1",
            "notify_setting_batchtime": "3600",
            "notify_setting_self": "0",
            "notify_setting_selfemail": "0",
            "types": "filesystem"
        },
        "admin_audit": {
            "enabled": "yes",
            "installed_version": "1.24.0",
            "types": "logging"
        },
        "app_api": {
            "enabled": "no",
            "installed_version": "4.0.0",
            "types": ""
        },
        "appstore": {
            "enabled": "yes",
            "installed_version": "1.0.0",
            "types": ""
        },
        "backgroundjob": {
            "lastjob": "14905"
        },
        "bruteforcesettings": {
            "apply_allowlist_to_ratelimit": "1",
            "enabled": "yes",
            "installed_version": "7.0.0",
            "types": ""
        },
        "circles": {
            "enabled": "no",
            "installed_version": "22.1.1",
            "loopback_tmp_scheme": "http",
            "types": "filesystem,dav"
        },
        "cloud_federation_api": {
            "enabled": "yes",
            "installed_version": "1.18.0",
            "types": "filesystem"
        },
        "comments": {
            "enabled": "no",
            "installed_version": "1.10.0",
            "types": "logging"
        },
        "contactsinteraction": {
            "enabled": "no",
            "installed_version": "1.1.0",
            "types": "dav"
        },
        "core": {
            "backgroundjobs_mode": "cron",
            "emailTestSuccessful": "1",
            "files_metadata_installed": "1",
            "installedat": "1610199364.6647",
            "lastcron": 1792673400,
            "lastupdateResult": "{\"version\":\"35.0.2.2\",\"versionstring\":\"Nextcloud 35.0.2\",\"url\":\"https:\\\/\\\/download.nextcloud.com\\\/server\\\/releases\\\/nextcloud-35.0.2.zip\",\"web\":\"https:\\\/\\\/docs.nextcloud.com\\\/server\\\/35\\\/admin_manual\\\/maintenance\\\/upgrade.html\",\"changes\":\"https:\\\/\\\/updates.nextcloud.com\\\/changelog_server\\\/?version=35.0.2\",\"autoupdater\":\"1\",\"eol\":\"0\"}",
            "lastupdatedat": 1792672779,
            "metadataGenerationDone": true,
            "moveavatarsdone": "yes",
            "newUser.sendEmail": "no",
            "previewMovedDone": true,
            "previewsCleanedUp": "1",
            "public_files": "files_sharing\/public.php",
            "public_webdav": "dav\/appinfo\/v1\/publicwebdav.php",
            "shareapi_allow_group_sharing": "no",
            "shareapi_allow_public_upload": "no",
            "shareapi_allow_resharing": "no",
            "shareapi_default_expire_date": true,
            "shareapi_default_internal_expire_date": "yes",
            "shareapi_default_permission_cancreate": "no",
            "shareapi_default_permission_candelete": "no",
            "shareapi_default_permission_canshare": "no",
            "shareapi_default_permission_canupdate": "no",
            "shareapi_default_permissions": "1",
            "shareapi_default_remote_expire_date": "no",
            "shareapi_enabled": "yes",
            "shareapi_enforce_expire_date": false,
            "shareapi_enforce_internal_expire_date": "no",
            "shareapi_enforce_remote_expire_date": "no",
            "shareapi_expire_after_n_days": "30",
            "shareapi_internal_expire_after_n_days": "30",
            "theming.variables": "d41d8cd98f00b204e9800998ecf8427e",
            "vendor": "nextcloud",
            "files_metadata": {
                "photos-original_date_time": {
                    "value": null,
                    "type": "int",
                    "etag": "",
                    "indexed": true,
                    "editPermission": 0
                },
                "photos-exif": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-ifd0": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-size": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-gps": {
                    "value": null,
                    "type": "array",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 0
                },
                "photos-place": {
                    "value": null,
                    "type": "string",
                    "etag": "",
                    "indexed": true,
                    "editPermission": 0
                },
                "files-live-photo": {
                    "value": null,
                    "type": "string",
                    "etag": "",
                    "indexed": false,
                    "editPermission": 2
                },
                "blurhash": {
                    "value": null,
                    "type": "string",
                    "etag": "72c812e0760866e0c89e45fea9cdbd28",
                    "indexed": false,
                    "editPermission": 0
                }
            },
            "oc.integritycheck.checker": [],
            "share_repair_removed_trailing_slashes": true
        },
        "customproperties": {
            "enabled": "no",
            "installed_version": "2.0.4",
            "types": ""
        },
        "dashboard": {
            "enabled": "no",
            "installed_version": "7.0.0",
            "types": ""
        },
        "dav": {
            "buildCalendarReminderIndex": "yes",
            "buildCalendarSearchIndex": "yes",
            "builtSocialSearchIndex": "yes",
            "checked_for_classified_activity": true,
            "chunks_migrated": "1",
            "enabled": "yes",
            "installed_version": "1.40.0",
            "regeneratedBirthdayCalendarsForYearFix": "yes",
            "types": "filesystem"
        },
        "duplicatefinder": {
            "enabled": "no",
            "ignore_mounted_files": "true",
            "installed_version": "1.8.1",
            "types": ""
        },
        "federatedfilesharing": {
            "enabled": "yes",
            "installed_version": "1.24.0",
            "types": ""
        },
        "federation": {
            "enabled": "no",
            "installed_version": "1.10.1",
            "types": "authentication"
        },
        "files": {
            "cronjob_scan_files": "500",
            "enabled": "yes",
            "installed_version": "2.6.0",
            "mimetype_version": "33.0.2.2",
            "types": "filesystem"
        },
        "files_downloadlimit": {
            "enabled": "no",
            "installed_version": "3.0.0",
            "types": ""
        },
        "files_external": {
            "enabled": "yes",
            "installed_version": "1.26.0",
            "types": "filesystem",
            "allow_user_mounting": false,
            "user_mounting_backends": "dav,owncloud,sftp,amazons3,swift,smb,\\OC\\Files\\Storage\\SFTP_Key,\\OC\\Files\\Storage\\SMB_OC"
        },
        "files_lock": {
            "enabled": "yes",
            "installed_version": "34.0.1",
            "types": "filesystem,dav"
        },
        "files_pdfviewer": {
            "enabled": "yes",
            "installed_version": "7.0.0",
            "types": ""
        },
        "files_reminders": {
            "enabled": "yes",
            "installed_version": "1.7.0",
            "types": ""
        },
        "files_rightclick": {
            "enabled": "no",
            "installed_version": "1.6.0",
            "types": ""
        },
        "files_sharing": {
            "enabled": "yes",
            "incoming_server2server_share_enabled": "no",
            "installed_version": "1.26.0",
            "lookupServerEnabled": "no",
            "lookupServerUploadEnabled": "no",
            "outgoing_server2server_share_enabled": "no",
            "types": "filesystem"
        },
        "files_trashbin": {
            "background_job_expire_trash_offset": 0,
            "enabled": "yes",
            "installed_version": "1.24.0",
            "types": "filesystem,dav"
        },
        "files_versions": {
            "enabled": "no",
            "installed_version": "1.13.0",
            "types": "filesystem,dav"
        },
        "firstrunwizard": {
            "enabled": "no",
            "installed_version": "2.13.0",
            "types": "logging"
        },
        "integration_google": {
            "enabled": "no",
            "installed_version": "2.0.0",
            "types": ""
        },
        "logreader": {
            "enabled": "yes",
            "installed_version": "7.0.0",
            "shownLevels": "[0,1,2,3,4]",
            "types": "logging"
        },
        "lookup_server_connector": {
            "enabled": "yes",
            "installed_version": "1.22.0",
            "types": "authentication"
        },
        "memories": {
            "enabled": "yes",
            "installed_version": "10.1.0",
            "last_index_job_duration": "1.35",
            "last_index_job_start": "1792672500",
            "last_index_job_status": "Indexing completed successfully",
            "last_index_job_status_type": "success",
            "types": ""
        },
        "metadata": {
            "enabled": "no",
            "installed_version": "0.24.0",
            "types": ""
        },
        "nextcloud_announcements": {
            "enabled": "no",
            "installed_version": "1.9.0",
            "pub_date": "Thu, 24 Oct 2019 00:00:00 +0200",
            "types": "logging"
        },
        "notifications": {
            "enabled": "yes",
            "installed_version": "7.0.0-dev.1",
            "types": "logging",
            "webpush_vapid_privkey": "***REMOVED SENSITIVE VALUE***",
            "webpush_vapid_pubkey": "BID5FXnByGFUfM6gn_2MGpF4UWjer5ecNwVYxhlKM8uQlAYB772uGMoMQKIAtxV_29n4i2wy6vk0t0XcA9dvHAg"
        },
        "oauth2": {
            "enabled": "yes",
            "installed_version": "1.22.0",
            "types": "authentication"
        },
        "office": {
            "enabled": "yes",
            "installed_version": "1.0.0",
            "types": ""
        },
        "password_policy": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "minLength": "8",
            "types": "authentication"
        },
        "photos": {
            "enabled": "yes",
            "installed_version": "7.0.0",
            "lastPlaceMappedUser": "winghongtam",
            "lastPlaceMappingDone": "true",
            "types": "authentication,dav"
        },
        "preview": {
            "jpeg_quality": "60",
            "webp_quality": "80"
        },
        "previewgenerator": {
            "coverWidthHeightSizes": "256",
            "enabled": "yes",
            "fillWidthHeightSizes": "256 4096",
            "heightSizes": "",
            "installed_version": "5.15.0",
            "job_disabled": true,
            "squareSizes": "64 256",
            "types": "filesystem",
            "widthSizes": ""
        },
        "privacy": {
            "enabled": "yes",
            "fullDiskEncryptionEnabled": "0",
            "installed_version": "6.0.0-dev.1",
            "types": ""
        },
        "profile": {
            "enabled": "yes",
            "installed_version": "1.3.0",
            "types": ""
        },
        "provisioning_api": {
            "enabled": "yes",
            "installed_version": "1.24.0",
            "types": "prevent_group_restriction"
        },
        "recommendations": {
            "enabled": "no",
            "installed_version": "1.3.0",
            "types": ""
        },
        "related_resources": {
            "enabled": "no",
            "installed_version": "1.3.0",
            "types": ""
        },
        "richdocuments": {
            "enabled": "no",
            "installed_version": "7.0.2",
            "types": "prevent_group_restriction"
        },
        "serverinfo": {
            "cached_count_appdata_files": 723,
            "cached_count_filecache": 268165,
            "cached_count_storages": 107,
            "enabled": "yes",
            "installed_version": "6.0.0",
            "size_appdata_storage": 80379062,
            "types": ""
        },
        "settings": {
            "enabled": "yes",
            "installed_version": "1.17.0",
            "profile_enabled_by_default": "0",
            "types": ""
        },
        "sharebymail": {
            "enabled": "yes",
            "installed_version": "1.24.0",
            "types": "filesystem"
        },
        "support": {
            "enabled": "no",
            "installed_version": "1.3.0",
            "types": "session"
        },
        "survey_client": {
            "enabled": "yes",
            "installed_version": "6.0.0-dev.0",
            "last_sent": 1791005702,
            "types": "",
            "last_report": "{\"id\":\"oc99n3wt6j8b\",\"items\":[[\"server\",\"version\",\"34.0.4.1\"],[\"server\",\"code\",\"other\"],[\"server\",\"enable_avatars\",\"yes\"],[\"server\",\"enable_previews\",\"yes\"],[\"server\",\"memcache.local\",\"\\\\OC\\\\Memcache\\\\APCu\"],[\"server\",\"memcache.distributed\",\"\\\\OC\\\\Memcache\\\\Redis\"],[\"server\",\"asset-pipeline.enabled\",\"no\"],[\"server\",\"filelocking.enabled\",\"yes\"],[\"server\",\"memcache.locking\",\"\\\\OC\\\\Memcache\\\\Redis\"],[\"server\",\"debug\",\"no\"],[\"server\",\"cron\",\"cron\"],[\"php\",\"version\",\"8.5.10\"],[\"php\",\"memory_limit\",1073741824],[\"php\",\"max_execution_time\",0],[\"php\",\"upload_max_filesize\",17179869184],[\"database\",\"type\",\"mysql\"],[\"database\",\"version\",\"11.8.8\"],[\"database\",\"size\",1739243520],[\"apps\",\"activity\",\"7.0.0\"],[\"apps\",\"admin_audit\",\"1.24.0\"],[\"apps\",\"app_api\",\"disabled\"],[\"apps\",\"appstore\",\"1.0.0\"],[\"apps\",\"bruteforcesettings\",\"7.0.0\"],[\"apps\",\"circles\",\"disabled\"],[\"apps\",\"cloud_federation_api\",\"1.18.0\"],[\"apps\",\"comments\",\"disabled\"],[\"apps\",\"contactsinteraction\",\"disabled\"],[\"apps\",\"customproperties\",\"disabled\"],[\"apps\",\"dashboard\",\"disabled\"],[\"apps\",\"dav\",\"1.40.0\"],[\"apps\",\"duplicatefinder\",\"disabled\"],[\"apps\",\"federatedfilesharing\",\"1.24.0\"],[\"apps\",\"federation\",\"disabled\"],[\"apps\",\"files\",\"2.6.0\"],[\"apps\",\"files_downloadlimit\",\"disabled\"],[\"apps\",\"files_external\",\"1.26.0\"],[\"apps\",\"files_lock\",\"34.0.1\"],[\"apps\",\"files_pdfviewer\",\"7.0.0\"],[\"apps\",\"files_reminders\",\"1.7.0\"],[\"apps\",\"files_rightclick\",\"disabled\"],[\"apps\",\"files_sharing\",\"1.26.0\"],[\"apps\",\"files_trashbin\",\"1.24.0\"],[\"apps\",\"files_versions\",\"disabled\"],[\"apps\",\"firstrunwizard\",\"disabled\"],[\"apps\",\"integration_google\",\"disabled\"],[\"apps\",\"logreader\",\"7.0.0\"],[\"apps\",\"lookup_server_connector\",\"1.22.0\"],[\"apps\",\"memories\",\"9.0.1\"],[\"apps\",\"metadata\",\"disabled\"],[\"apps\",\"nextcloud_announcements\",\"disabled\"],[\"apps\",\"notifications\",\"7.0.0-dev.1\"],[\"apps\",\"oauth2\",\"1.22.0\"],[\"apps\",\"office\",\"1.0.0\"],[\"apps\",\"password_policy\",\"6.0.0-dev.0\"],[\"apps\",\"photos\",\"7.0.0\"],[\"apps\",\"previewgenerator\",\"5.15.0\"],[\"apps\",\"privacy\",\"6.0.0-dev.1\"],[\"apps\",\"profile\",\"1.3.0\"],[\"apps\",\"provisioning_api\",\"1.24.0\"],[\"apps\",\"recommendations\",\"disabled\"],[\"apps\",\"related_resources\",\"disabled\"],[\"apps\",\"richdocuments\",\"disabled\"],[\"apps\",\"serverinfo\",\"6.0.0\"],[\"apps\",\"settings\",\"1.17.0\"],[\"apps\",\"sharebymail\",\"1.24.0\"],[\"apps\",\"support\",\"disabled\"],[\"apps\",\"survey_client\",\"6.0.0-dev.0\"],[\"apps\",\"suspicious_login\",\"disabled\"],[\"apps\",\"systemtags\",\"disabled\"],[\"apps\",\"text\",\"disabled\"],[\"apps\",\"theming\",\"disabled\"],[\"apps\",\"twofactor_admin\",\"disabled\"],[\"apps\",\"twofactor_backupcodes\",\"1.23.0\"],[\"apps\",\"twofactor_totp\",\"16.0.0\"],[\"apps\",\"updatenotification\",\"1.24.0\"],[\"apps\",\"user_status\",\"disabled\"],[\"apps\",\"video_converter\",\"disabled\"],[\"apps\",\"viewer\",\"7.0.0-dev.0\"],[\"apps\",\"weather_status\",\"disabled\"],[\"apps\",\"webhook_listeners\",\"disabled\"],[\"apps\",\"workflowengine\",\"2.16.0\"],[\"stats\",\"num_files\",268007],[\"stats\",\"num_users\",7],[\"stats\",\"num_storages\",107],[\"stats\",\"num_storages_local\",3],[\"stats\",\"num_storages_home\",7],[\"stats\",\"num_storages_other\",97],[\"stats\",\"num_comments\",0],[\"stats\",\"num_comment_markers\",0],[\"stats\",\"num_systemtags\",0],[\"stats\",\"num_systemtags_mappings\",0],[\"files_sharing\",\"num_shares\",2],[\"files_sharing\",\"num_shares_user\",2],[\"files_sharing\",\"num_shares_groups\",0],[\"files_sharing\",\"num_shares_link\",0],[\"files_sharing\",\"num_shares_link_no_password\",0],[\"files_sharing\",\"num_fed_shares_sent\",0],[\"files_sharing\",\"num_fed_shares_received\",0],[\"files_sharing\",\"permissions_0_31\",2],[\"encryption\",\"enabled\",\"no\"],[\"encryption\",\"default_module\",\"no\"]]}"
        },
        "suspicious_login": {
            "enabled": "no",
            "installed_version": "4.3.0",
            "types": "authentication"
        },
        "systemtags": {
            "enabled": "no",
            "installed_version": "1.10.0",
            "types": "logging"
        },
        "text": {
            "enabled": "no",
            "installed_version": "3.5.1",
            "types": "dav"
        },
        "theming": {
            "enabled": "no",
            "installed_version": "2.9.0",
            "types": "logging"
        },
        "twofactor_admin": {
            "enabled": "no",
            "installed_version": "4.12.0",
            "types": ""
        },
        "twofactor_backupcodes": {
            "enabled": "yes",
            "installed_version": "1.23.0",
            "types": ""
        },
        "twofactor_totp": {
            "enabled": "yes",
            "installed_version": "16.0.0",
            "types": ""
        },
        "updatenotification": {
            "core": "35.0.2.2",
            "duplicatefinder": "1.6.1",
            "enabled": "yes",
            "installed_version": "1.24.0",
            "memories": "10.0.1",
            "metadata": "0.23.0",
            "previewgenerator": "5.15.0",
            "related_resources": "1.0.4",
            "twofactor_admin": "4.8.0",
            "twofactor_totp": "6.4.1",
            "types": "",
            "update_check_errors": 0,
            "video_converter": "1.0.4"
        },
        "user_status": {
            "enabled": "no",
            "installed_version": "1.0.1",
            "types": ""
        },
        "video_converter": {
            "enabled": "no",
            "installed_version": "1.0.5",
            "types": ""
        },
        "viewer": {
            "enabled": "yes",
            "installed_version": "7.0.0-dev.0",
            "types": ""
        },
        "weather_status": {
            "enabled": "no",
            "installed_version": "1.0.0",
            "types": ""
        },
        "webhook_listeners": {
            "enabled": "no",
            "installed_version": "1.1.0-dev",
            "types": "filesystem"
        },
        "workflowengine": {
            "enabled": "yes",
            "installed_version": "2.16.0",
            "types": "filesystem"
        }
    }
}

List of activated Apps

Enabled:
  - activity: 7.0.0
  - admin_audit: 1.24.0
  - appstore: 1.0.0
  - bruteforcesettings: 7.0.0
  - cloud_federation_api: 1.18.0
  - dav: 1.40.0
  - federatedfilesharing: 1.24.0
  - files: 2.6.0
  - files_external: 1.26.0
  - files_lock: 34.0.1
  - files_pdfviewer: 7.0.0
  - files_reminders: 1.7.0
  - files_sharing: 1.26.0
  - files_trashbin: 1.24.0
  - logreader: 7.0.0
  - lookup_server_connector: 1.22.0
  - memories: 10.1.0
  - notifications: 7.0.0-dev.1
  - oauth2: 1.22.0
  - office: 1.0.0
  - password_policy: 6.0.0-dev.0
  - photos: 7.0.0
  - previewgenerator: 5.15.0
  - privacy: 6.0.0-dev.1
  - profile: 1.3.0
  - provisioning_api: 1.24.0
  - serverinfo: 6.0.0
  - settings: 1.17.0
  - sharebymail: 1.24.0
  - survey_client: 6.0.0-dev.0
  - theming: 2.9.0
  - twofactor_backupcodes: 1.23.0
  - twofactor_totp: 16.0.0
  - updatenotification: 1.24.0
  - viewer: 7.0.0-dev.0
  - workflowengine: 2.16.0
Disabled:
  - app_api: 34.0.0 (installed 4.0.0)
  - circles: 34.0.0 (installed 22.1.1)
  - comments: 1.24.0 (installed 1.10.0)
  - contactsinteraction: 1.15.0 (installed 1.1.0)
  - dashboard: 7.14.0 (installed 7.0.0)
  - duplicatefinder: 1.8.1 (installed 1.8.1)
  - encryption: 2.22.0
  - federation: 1.24.0 (installed 1.10.1)
  - files_downloadlimit: 5.2.0 (installed 3.0.0)
  - files_versions: 1.27.0 (installed 1.13.0)
  - firstrunwizard: 7.0.0-dev.0 (installed 2.13.0)
  - metadata: 0.24.0 (installed 0.24.0)
  - nextcloud_announcements: 6.0.0 (installed 1.9.0)
  - recommendations: 7.0.0 (installed 1.3.0)
  - related_resources: 5.0.0-dev.0 (installed 1.3.0)
  - support: 6.0.0 (installed 1.3.0)
  - suspicious_login: 12.0.0-dev.0 (installed 4.3.0)
  - systemtags: 1.24.0 (installed 1.10.0)
  - text: 8.0.0 (installed 3.5.1)
  - twofactor_admin: 4.12.0 (installed 4.12.0)
  - twofactor_nextcloud_notification: 8.0.0
  - user_ldap: 1.25.0
  - user_status: 1.14.0 (installed 1.0.1)
  - weather_status: 1.14.0 (installed 1.0.0)
  - webhook_listeners: 1.6.0 (installed 1.1.0-dev)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

NO logs are generated at all, even at `loglevel=>0`

Additional info

I tried manually generating a preview occ preview:generate path/to/file/filename.heic and it returns No preview generator available for file of typeimage/heic

But even this command does not generate a log entry, which is making troubleshooting a bit difficult.