Hello @CaptainBasch, 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/7045#issuecomment-1777122435.
proton 8.0-4x1 2023-10proton experimentalx1 2023-10
Compatibility Report
System Information
I confirm:
steam-1888160.log
Symptoms
The decal cursor does not recognize the surface of the Armored Core model when in decal placing mode. As a result, decorating Armored Cores with decals is almost completely non-functional.
Reproduction