A keyboard bug occurs at RUST.

[iyagicom]

Which distribution and version?: ubuntu 18.04

Which session type?:
$ loginctl show-session 2 -p Type
Type=x11

IBus version?:
1.5.17

RUST continues typing even when the key you typed in the game is released.
I replaced it with UIM and the bug disappeared.

See community questions.
https://steamcommunity.com/app/252490/discussions/0/1778262124932432473/

[LRitzdorf]

This seems to be the appropriate place to raise ValveSoftware/Proton#5294. To summarize: after being held down for several seconds, keys seem to become "stuck" in the pressed state until they are pressed and released again. I've personally observed this in Deep Rock Galactic, running via Proton under X11 on Arch Linux, though the above issue details other setups for which this issue has also occurred.

Limited testing has found that uninstalling or simply killing the IBus daemon are sufficient to resolve the issue.