OK, I fixed my problem, which may or may not be what others in this thread are dealing with.
Basically, I had an actor that when destroyed would spawn a geometry collection where the actor’s mesh was. The actor would then call destroy and remove itself, leaving only the newly spawned geometry collection.
Adding a small delay of 10 milliseconds before spawning the geo collection is what fixed the crash for me. I have no idea why. The actor is still getting destroyed during the same frame as the geo collision is spawned, so as far as I can tell, it changed nothing, yet it fixes my problem completely.