We've recently realized there's a pretty large discrepancy between the crash rate Crashlytics has been reporting and the crash rate reported in App Store Connect. Historically, we've been hovering at above 99% crash-free users / sessions as reported by Crashlytics. However, recently we've noticed App Store Connect has reported our crash rate to be between 3.5% and 4% for much of our app's recent history (i.e. the last year). How is this crash rate determined? After diving into Xcode's organizer to look at crashes, we found one particular crash that has been occurring quite a bit. Unfortunately, it has a pretty generic name and stacktrace: CoreFoundation: __CFRunLoopServiceMachPort + 160 8 UIKitCore -[UIApplication _run] 9 UIKitCore UIApplicationMain 10 tenpercenthappier main 11 dyld start Are these crashes being missed by Crashlytics, or is there some issue with dSYSMs in Crashlytics? Any thoughts or suggestions for how to figure out what's going on here would be much appreciated.