Gamemoderun cannot take effect on real game processes in steam

[yuyuen72]

Describe the bug
I set renice=5 in gamemode.ini, yes,it take effect, you can see it reniced "reaper", "perssure-vessel-wrap", "pressure-vessel-adverb" and "cs2.sh", but the real game processes cs2 and dota2 witch is take lots of memory has no effect.

To Reproduce
Steps used to reproduce the behavior:

1. set "gamemoderun %command%" in steam for CS2 or DotA2 or maybe others but I only have this 2 game.
2. Run game
3. open system-monitor
4. See nice number in system-monitor

Expected behavior
I think "reaper", "perssure-vessel-wrap", "pressure-vessel-adverb" and "cs2.sh" shouldn't be reniced, because maybe it will waste system resources. The real game processes should be reniced.

System Info (please complete the following information):

• OS and version: [Ubuntu 20.04]
• GameMode Version [1.8.1]

Additional context
no.

[Tiagoquix]

I can confirm this also happens with Proton games.

Edit: the renice works with Team Fortress 2 (native), but does not work with Dead by Daylight (Proton).