I am experiencing this same issue in apps that include our SDK. I have tracked the crash down to when we call URLSession.shared during the SDK initialization.
* thread #10, name = 'Task 1', queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x257b8318c)
frame #0: 0x0000000257b8318c
frame #1: 0x0000000257b80d14
frame #2: 0x0000000257b80b8c
frame #3: 0x0000000257b80b68
frame #4: 0x0000000257b80c98
frame #5: 0x0000000257b8a1bc
frame #6: 0x0000000257b8a8e4
frame #7: 0x0000000257b80b8c
frame #8: 0x0000000257b80b68
frame #9: 0x0000000257b8a888
frame #10: 0x000000018931ccf4
frame #11: 0x000000018931f044
frame #12: 0x00000001888a3bfc
frame #13: 0x00000001888a3a94
frame #14: 0x00000001801d34b0
frame #15: 0x00000001801bb3d4
frame #16: 0x00000001888a6f30
frame #17: 0x0000000184e9fc10 CFNetwork`-[NSURLSessionConfiguration initWithDisposition:] + 352
frame #18: 0x0000000184ea0174 CFNetwork`__65+[NSURLSessionConfiguration sessionConfigurationForSharedSession]_block_invoke + 36
frame #19: 0x00000001045919dc libdispatch.dylib`_dispatch_client_callout + 12
frame #20: 0x000000010457adf0 libdispatch.dylib`_dispatch_once_callout + 84
frame #21: 0x0000000184e9ff00 CFNetwork`+[NSURLSessionConfiguration sessionConfigurationForSharedSession] + 64
frame #22: 0x0000000184e239d4 CFNetwork`__30+[NSURLSession _sharedSession]_block_invoke + 24
frame #23: 0x00000001045919dc libdispatch.dylib`_dispatch_client_callout + 12
frame #24: 0x000000010457adf0 libdispatch.dylib`_dispatch_once_callout + 84
frame #25: 0x0000000184e239b8 CFNetwork`+[NSURLSession _sharedSession] + 192
The strange thing is that this DOES NOT crash with the previous version of our SDK. This latest release adds another library that has its own call to URLSession.shared in it. Whats even weirder is that none of that code is even executed when our SDK initializes. If I comment out the one line of code that accesses that library, I can launch my demo app with no issue.