Had the same issue. It's related to the thread sanitizer in the simluator. Followed the instructions in this other post and this resolved the issue for me: https://forums.developer.apple.com/thread/126891
estebantinder
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We're seeing the same issue with our app when building on 10.15.2 and running in the simulator. Turning off TSAN in simulator as suggested resolved it for us. Any idea of when we can expect a fix? Thanks!