For an iOS beta project in a Xamarin Forms app with App Center, I injected test crash code (division by zero). When I load the app locally over USB and invoke the crash, a crash report appears in App Center diagnostics showing the call stack. The method names are symbolicated (not sure how, since I had not uploaded symbols yet) but without line numbers. Uploading zipped symbols from the same build afterwards made no difference. (Analytics came through Ok.)
However when I distribute the exact same app via Xcode/TestFlight (not Fastlane) and invoke the crash, no crash report appears in App Center diagnostics. (Analytics again come through OK.)
I did restart the app immediately after crashing each time.
So my question is, is it normal not to get App Center crash reports with Xcode/TestFlight? And given that I don't, could I nevertheless expect to get App Center crash reports after I submit to App Store production via Xcode? Or to get crash reports, am I expected to use the native App Center distribution, rather than Xcode? Or would Fastlane solve the problem? I'm unable to find any of this in documentation or web searches. Help appreciated! All software latest version.