I wanted to report on something I noticed. While testing in a standalone dedicated server environment, I noticed that my vehicle meshes weren’t actually disappearing, their simulated proxy roles were just way out of position. I disabled the workaround and I see identical behavior – sometimes everything is fine, sometimes transforms are way out of sync (as if replication has quit).
This might be a completely separate issue. I’m going to do some more testing today. It’s arduous because it doesn’t seem to happen in PIE.