Resetting various settings can delete comments from settings.json file

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.105.1
• OS Version: Linux x64 6.17.6-1-default

Version: 1.105.1
Commit: 7d842fb85a0275a4a8e4d7e040d2625abbf7f084
Date: 2025-10-14T22:33:36.618Z
Electron: 37.6.0
ElectronBuildId: 12502201
Chromium: 138.0.7204.251
Node.js: 22.19.0
V8: 13.8.258.32-electron.0
OS: Linux x64 6.17.6-1-default

Description:

When going from anything but window.zoomLevel: 0 to window.zoomLevel: 0 via either

• the UI "View/Appearance/Zoom In" or "View/Appearance/Zoom Out"
• or the Keyboard Shortcuts "Ctrl+=" or "Ctrl+-",

the setting disappears from the User settings.json via deleting it's line but also deletes one line above it, should it be a comment or another commented out line.

See attached screenshots of a diff from my settings.json file after resetting the zoom level to 0 via keyboard shortcut "Ctrl+=" (e.g. going from window.zoomLevel: -0.5 to window.zoomLevel: 0):

Steps to Reproduce:

1. Start in neutral zoom setting (window.zoomLevel: 0)
2. Press "Ctrl+-" to set window.zoomLevel: -1
3. Find window.zoomLevel: -1 in your user settings.json file
4. Add a line above the setting with a comment: // test
5. Save and close settings.json
6. Press "Ctrl+=" to set window.zoomLevel: 0
7. Try finding window.zoomLevel in your user settings.json, it is gone (expected)
8. Try finding your manually added comment one line above it, it is also gone (bug)

Suggestion:

Naive first idea: Allow the window.zoomLevel setting to remain in the user settings.json file, even at value "0".