I seem to have tracted it to a particle system existing in an actor
attached are the t3ds of the “box” actor - one in its pre crashing state (good) and one when it crashes (bad) - ive also included the particle system… its hard to narrow in on this but I think its the particle systemlink text
I still haven’t been able to reproduce your exact bug, but I have entered in a bug report (TTP# 343859) with our developers linking all of your provided data and logs.