Spawning an object with ARKitCameraMaterial will now crash the app.
Tested with 2nd Gen iPad Pro (A1701)
Verified in 4.23 MAIN @ CL 5806859 (Needed to install from IPA)
Result: When spawning BP_Placeable the app will crash.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-72741 in the post.