Hello @Kawazu0, 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/150#issuecomment-3694150916.
proton 9.0-4x1 2025-12proton experimentalx1 2025-12
Compatibility Report
System Information
I confirm:
steam-359320-10.0-3.log.gz
steam-359320-experimental.log.gz
Symptoms
The easiest way to describe the corruption of planet surface generator is to show it
The right surface under Windows, proton 9.0-4 and 10.0-3

The wrong surface under proton experimental and hotfix

Reproduction
Just land on a planet with relatively straight surface to get sine waves, and "not enough floating point precision" altitudes