Linux x86_64; real packaged AppImage; isolated data; 1920x1080. Case: transition.
Installed ~/Applications/T3-Code-0.1.9-x86_64.AppImage; stable symlink T3-Code.AppImage; desktop entry launches that symlink.
Initial desktop-entry launch opened the app.
Initial updater state: version=0.1.9, status=idle, offered=null, downloaded=null
Checked the local release feed.
Downloaded through the app updater.
Downloaded state: version=0.1.9, status=downloaded, offered=0.1.11, downloaded=0.1.11
Updater restart opened a visible app window.
After update: original path exists; stable launcher resolves; files: T3-Code-0.1.9-x86_64.AppImage, T3-Code-x86_64.AppImage, T3-Code.AppImage
Quit the app; launching the same desktop entry again.
Desktop-entry relaunch command exit: 0
PASS: desktop entry reopened the updated app.