Hi Stefan, thanks for flagging this. It looks like version 140 broke the "Install as App" behavior on Ubuntu apps now open as regular Edge windows instead of sticking to their icons. Since version 139 worked fine, rolling back might be a temporary fix.
You might also want to report this via Edge’s feedback tool, so it gets visibility.
Also, are you seeing this behavior with all apps installed, or just specific ones (e.g., Gmail, Outlook)?
Chard