I know there is an issue for Arma 3, but this is specifically for the ACRE 2 mod, so I figured it really fit better in its own issue.
Hello @Tinter, we're using one issue report per unofficially supported game title, and in general, mods for a game are still considered the same game, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/2364#issuecomment-978118731.
Compatibility Report
System Information
I confirm:
Symptoms
An ACRE2 issue, the authors believe it to be Proton: https://github.com/IDI-Systems/acre2/issues/1157
When running the game with the ACRE 2 mod in singleplayer or local multiplayer, the game will freeze within a minute and become unresponsive, necessitating a sigkill.
Logs are in the issue linked above.
Reproduction