+1 me too. This is really frustrating. Filing "feedback" with Apple, hopefully it bears fruit.
MeteAnsuR
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I've got the same problem - "ITMS-90338: Non-public API usage - The app
contains or inherits from non-public classes in My_App_Name:
NSConstantArray". But I tried building with Xcode 12 and the problem
persists - I haven't included any new 3rd party frameworks since the
last submission, but it's a huge project with quite a lot of them. At
this stage I've also no idea how to track down exactly where this
NSConstantArray is being found. Incredibly frustrating. Will watch this space...