The 100% worked solution is:
Turn you Apple Watch off, and every thing is OK.
PS: Sold it on eBay may work fine I guess :)
Akring
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Today is April 24 2022 and this problem is still existing on the newest Xcode 12.3.1.
The "seconds" saved by your complier optimized are all payed back with "minutes".
So I guess we iOS developers should NOT purchase any Apple Watch in the future?
Updated to Xcode 12.0.1, problem NOT solved. 😂
One of the most weird bug I'v ever met on Xcode.