Chiming in hoping this gets some more traction - we're seeing this crash too in our logs.
Our crashes match the above call stack onward from [NSUbiquitousKeyValueStore defaultStore]. The code in question hasn't been directly modified in many years.
iOS 15.0 and 15.1 only. Build with Xcode 13. Build is in TestFlight only.
No user has reported an actual crash. Possibly this crash happens when the app starts for the first time? Users are typically fine with reopening an app if it crashed right after starting.
GerardMeier
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