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.
[UE4] Assertion failed: UniformExpressionCache.bUpToDate && UniformExpressionCache.UniformBuffer [File:/Users/joe.conley/Perforce/UE4/Release-4.22/Engine/Source/Runtime/Renderer/Private/ShaderBaseClasses.cpp] [Line: 379]
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-72741 in the post.