I would recommend adding Visual Studio app center to your app. You can get better analytics and crash reports when using it
Unknown crash reports

Téo Humeau
41
Reputation points
Since I'd include some threaded function in my UWP app, reports in the Partner Center are "Unknown".
I know it crashed in the threaded function because some customers send me mail for this and I still see good reports for functions in the main thread.
I checked out if there could be caused by the symbols included in my package, but they are in good standing and there aren't many parameters about this.
Is there anything that I miss to get good reports?