Hello @FurtadoPires, this issue should also be mentioned to the game's dev(s) if it hasn't been already.
Hello @FurtadoPires, this issue should also be mentioned to the game's dev(s) if it hasn't been already.
I already did it, I know this is a problem for the developers, but I also open an issue here because I think steam should be able to close the game even if it misbehaves
I can reproduce. Force Quit via the in game overlay works but the Quit button in the Steam client UI does nothing.
Next beta (> Oct 28) will have a fix for this.
I can confirm that the Nov 4 2020 works. The game still don't close properly, but at least we can now finish the process through the stop button.
Thank you @TTimo
Nothing extracted yet.
System information
Steam client version:

Distribution: Manjaro and Ubuntu
Opted into Steam client beta?: Yes
Have you checked for system updates?: Yes
Steam can't close the process of the game Magicka 2 (238370) after we exit the game. Even if I click on the "Stop" button won't do anything and will remain as a running process.
Steps for reproducing this issue: