iOS reject my app with "MTLDebugDevice"

Development Platform & Builds Mobile
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1

Apple :
Your app uses or references the following non-public APIs:

MTLDebugDevice

What is MTLDebugDevice ?

2

same problem, i’v tried to apply a QFE patch from Current Available Quick-Fix Solutions - Announcements - Unreal Engine Forums, but it didnt help…

3

Now I’m using 4.19 version. And It’s fine.