Several CSG parts used for vehicle bodies in this game (and several others in the series) are experiencing extreme distortion online. It doesn’t seem to occur 100% of the time, nor does it occur in the same way to each part each time.
It appears to fix itself when I move, then break when I stay idle for a second.
Here’s several screenshots from community members who are experiencing this issue. The earliest report I can find about this is from last Wednesday. I’ve experienced this issue myself on Windows 10.
Those distortions seem to be more and more common, I don’t think it is only for CSG, as I’ve seen MeshParts behave like this, not sure about standard bricks though.