I can reproduce this on a separate Ubuntu 26.04 system using the current Valve .deb launcher and stable client.
System:
Behavior:
I captured Steam's live UI logs while reproducing it several times. At 08:52:01, webhelper.txt records the relevant context-menu windows becoming visible. At 08:52:02, it records the Library context-menu window becoming hidden again. There is no subsequent command activation, uninstall request, confirmation-popup creation, backend error, crash, or GNOME journal warning.
For comparison, a working Settings-menu action at 08:49:24 immediately records creation of a new PopupWindow. The failed Uninstall attempts never reach that stage. This suggests that pointer input reaches the context menu and dismisses it, but the selected menu command is not activated.
Additional controls already tested:
I can collect a more targeted trace if there is a preferred Steam logging flag or component to instrument.
Nothing extracted yet.
Your system information
tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs]See attached
NVIDIA RTX 4060, driver 595.84
Please describe your issue in as much detail as possible:
Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist
Exact reproduction: desktop mode → right-click game → Manage → Uninstall does nothing; Big Picture successfully uninstalls the same game
Steps for reproducing this issue:
Exact reproduction: desktop mode → right-click game → Manage → Uninstall does nothing; Big Picture successfully uninstalls the same game
steam-logs.tar.gz