Unable stop games from stop button

When press the "Stop game" button, the games does not stop. Tested on Steam from Flathub, Ubuntu 22.04 and 24.04 distribution, Games: `MTG Arena`, `War Robots`, `Prodeus`, `Doom Eternal`, `Scorn`, etc.

Solve this pressing Ctrl+F4, but in some cases when the game crashes (for example War Robots in main loading game using proton) they cannot be closed through f4 control, but in the past they could be stopped from the steam stop button, now that it no longer works there are games that can only be stopped by killing all the processes. steam using the command `kill -9`.

The main problem is not the crashing of the games but the inability to use the stop button from the steam library dashboard.

Reproduce the failure using Steam from Flathub on Ubuntu 22.04 or 24.04 with the listed games, especially a game that crashes during loading. Compare the Steam library Stop button with Ctrl+F4 and observe which game processes remain; done means the Stop button reliably terminates the game without manually killing processes.

Written by the indexing model from the issue text.