@Elitic I guess I have the same exact problem, and there’s no real reason for that if internally 64bit are used for actor placement. Have a look at my post at the CESIUM forum, because I thought that maybe it was caused by the CESIUM plugin (it isn’t):
I really kills the UE5 implementation, and rebasing is not an option.
Did you send in an error report to Epic Games?
Best
Andreas