Hello @Captain-Rage, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/243#issuecomment-812559582.
proton 5.13x1 2021-04proton 6.3x1 2021-04
Compatibility Report
System Information
I confirm:
Symptoms
When starting ASTRONEER using Proton 6.3 a test card screen is shown for a brief moment, the loading bar appears, the main shows but freezes immediately and the game cannot be closed gracefully and has to be terminated. ASTRONEER was working fine in Proton 5.13.
Reproduction
Start ASTRONEER using Proton 6.3.