If CCD is enabled on a StaticMeshComponent in a class Blueprint, turning Simulate Physics on, then off, then attempting to modify component’s Rotation (world or relative) will crash editor. This is pretty reproducible for me.
Example scenario: you have an actor with behaviours that involve changing a component’s rotation, but you want it to simulate physics briefly (say, fall to ground) and then disable physics again and resume normal behaviour. Once simulate physics has been disabled and re-enabled, next attempt to set rotation will crash. Unless you haven’t got CCD on for component. But then maybe your thing falls through floor.