@tempt - I found the solution (at least for my problem) here: https://developer.apple.com/forums/thread/130599?answerId=662860022#662860022 The issue is that I was not deep copying element data from ARMeshAnchors, I was simply referencing it when making an SCNGeometry.

Having an identical crash on my codebase, looking for a workaround. If I can find one I'll post here. Note: In my case it's the same crash, but it happens in my codebase when calling from SCNNode.hitTestWithSegment