On macOS 27.3 with Dark Mode and automatic dark icons enabled (AppleIconAppearanceTheme = RegularAutomatic), Antigravity 2.32.1’s Dock icon stays on a solid white square while basically every other app turns dark.
I checked /Applications/Antigravity.app/Contents/Info.plist and it only sets CFBundleIconFile to icon.icns, with no Assets.car, CFBundleIconName, or .icon catalog in Contents/Resources. Without an asset catalog / dark appearance variant, macOS keeps falling back to the legacy .icns with the white background.
Adding an Assets.car / Icon Composer icon stack with a dark background variant would fix this for Dark Mode users.