Keys icons dissapering after language changing

Start by reproducing the issue in Firefox after changing the language, using the reported account configuration and virtual keyboard settings. Trace the virtual keyboard rendering and language-change flow, then verify that key labels remain visible after repeated language changes and that the intermittent reappearance is resolved.

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Is there an existing issue for this?

• I have searched the existing open and closed issues

Does the issue happen when logged in?

Yes

Does the issue happen when logged out?

Yes

Does the issue happen in incognito mode when logged in?

Yes

Does the issue happen in incognito mode when logged out?

Yes

Account name

anon112

Account config

{"theme":"superuser","themeLight":"serika","themeDark":"serika_dark","autoSwitchTheme":false,"customTheme":false,"customThemeColors":["#323437","#e2b714","#e2b714","#646669","#2c2e31","#d1d0c5","#ca4754","#7e2a33","#ca4754","#7e2a33"],"favThemes":[],"showKeyTips":true,"smoothCaret":"medium","codeUnindentOnBackspace":false,"quickRestart":"off","punctuation":true,"numbers":true,"words":35,"time":30,"mode":"words","quoteLength":[1],"language":"russian_25k","fontSize":2,"freedomMode":false,"difficulty":"normal","blindMode":false,"quickEnd":false,"caretStyle":"default","paceCaretStyle":"default","flipTestColors":false,"layout":"default","funbox":[],"confidenceMode":"off","indicateTypos":"off","compositionDisplay":"replace","timerStyle":"mini","liveSpeedStyle":"off","liveAccStyle":"off","liveBurstStyle":"off","colorfulMode":false,"randomTheme":"off","timerColor":"main","timerOpacity":"1","stopOnError":"off","showAllLines":false,"keymapMode":"react","keymapStyle":"split_matrix","keymapLegendStyle":"dynamic","keymapLayout":"russian","keymapKeys":"minimal","keymapSize":1,"fontFamily":"Roboto_Mono","smoothLineScroll":true,"alwaysShowDecimalPlaces":false,"alwaysShowWordsHistory":false,"singleListCommandLine":"on","capsLockWarning":true,"playSoundOnError":"off","playSoundOnClick":"off","soundVolume":0.3,"startGraphsAtZero":true,"showOutOfFocusWarning":true,"paceCaret":"off","paceCaretCustomSpeed":100,"repeatedPace":true,"accountChart":["on","on","on","on"],"minWpm":"off","minWpmCustomSpeed":100,"highlightMode":"letter","typedEffect":"keep","typingSpeedUnit":"wpm","ads":"result","hideExtraLetters":false,"strictSpace":false,"minAcc":"off","minAccCustom":90,"monkey":false,"repeatQuotes":"off","resultSaving":true,"oppositeShiftMode":"off","customBackground":"","customBackgroundSize":"cover","customBackgroundFilter":[0,1,1,1],"customLayoutfluid":["qwerty","dvorak","colemak"],"customPolyglot":["english","spanish","french","german"],"monkeyPowerLevel":"off","minBurst":"off","minBurstCustomSpeed":100,"burstHeatmap":false,"britishEnglish":false,"lazyMode":false,"showAverage":"both","showPb":false,"tapeMode":"off","tapeMargin":50,"maxLineWidth":0,"playTimeWarning":"off"}

Current Behavior

When I change the language, the letters on the virtual keyboard icons disappear (see video below). I've also noticed that sometimes they reappear randomly. This problem started recently

https://github.com/user-attachments/assets/e627c304-47d7-44c9-aaaf-d6457b661313

Expected Behavior

This hadnt happened before july

Steps To Reproduce

Change the language

Environment

• OS: Linux Fedora 44
• Browser: Firefox
• Browser Version: 152.0.4

Anything else?

No response