Same warning here with MapKit.
Thread Performance Checker: Thread running at User-interactive quality-of-service class waiting on a thread without a QoS class specified (base priority 0). Investigate ways to avoid priority inversions
PID: 77670, TID: 5270783
Backtrace
=================================================================
3 VectorKit 0x0000000193fef1a4 ___ZN3geo9TaskQueue5applyEmNSt3__18functionIFvmEEE_block_invoke + 40
4 libdispatch.dylib 0x00000001033e9778 _dispatch_client_callout2 + 16
5 libdispatch.dylib 0x000000010340066c _dispatch_apply_invoke3 + 400
6 libdispatch.dylib 0x00000001033e973c _dispatch_client_callout + 16
7 libdispatch.dylib 0x00000001033eb210 _dispatch_once_callout + 84
8 libdispatch.dylib 0x00000001033ff898 _dispatch_apply_redirect_invoke + 232
9 libdispatch.dylib 0x00000001033e973c _dispatch_client_callout + 16
10 libdispatch.dylib 0x00000001033fd5a4 _dispatch_root_queue_drain + 940
11 libdispatch.dylib 0x00000001033fdf18 _dispatch_worker_thread2 + 256
12 libsystem_pthread.dylib 0x00000001033437d8 _pthread_wqthread + 224
13 libsystem_pthread.dylib 0x00000001033425d4 start_wqthread + 8
Using Map(position: $cameraPosition) { } initializer.
zz2wd
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I tried many of the solutions here. What worked for me was unpairing the watch from iPhone and pairing it again, before connect iPhone to Xcode fresh new with a cable.