App built with Xcode 11.2 & 11.2.1 crashes on launch

We have an issue where an “Archive” build of our app built with 11.2 or 11.2.1 crashes on launch.

 

With an Xcode 11.1 Archive the app is fine.

 

This does not affect Debug builds of the application attached to Xcode directly either.

 

The following is what shows up as the offending code.

 

Thread 30 name:
Thread 30 Crashed:
0   libsystem_kernel.dylib         0x0000000183476efc __pthread_kill + 8
1   libsystem_pthread.dylib       0x0000000183396d10 pthread_kill + 196 (pthread.c:1456)
2   libsystem_c.dylib             0x0000000183326a74 abort + 104 (abort.c:110)
3   libswiftCore.dylib             0x0000000190f7b2a4 swift_runtime_unreachable(char const*) + 16 (Unreachable.h:30)
4   libswiftCore.dylib             0x0000000190f7ce34 swift_getWitnessTable + 2128 (Metadata.cpp:0)
5   Plane Finder Beta             0x0000000102f3ca68 closure #1 in closure #1 in AircraftManager.fetchLiveData(bounds:) + 212 (:0)
6   Plane Finder Beta             0x0000000102f1098c thunk for @escaping @callee_guaranteed () -> () + 28 (:0)
7   libdispatch.dylib             0x0000000183330b7c _dispatch_call_block_and_release + 32 (init.c:1408)
8   libdispatch.dylib             0x0000000183331fd8 _dispatch_client_callout + 20 (object.m:495)
9   libdispatch.dylib             0x0000000183334414 _dispatch_queue_override_invoke + 672 (inline_internal.h:2484)
10  libdispatch.dylib             0x0000000183340bd4 _dispatch_root_queue_drain + 348 (inline_internal.h:2525)
11  libdispatch.dylib             0x0000000183341384 _dispatch_worker_thread2 + 120 (queue.c:6628)
12  libsystem_pthread.dylib       0x0000000183397a54 _pthread_wqthread + 216 (pthread.c:2336)
13  libsystem_pthread.dylib       0x000000018339dc7c start_wqthread + 8

FB7432222 has been raised with the full crash log.

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