I created a simple UWP application with no code, just XAML.
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I am facing exactly same issue. I have been testing my application for the last 2 months and it never crashed because of MapControl. I submitted the application on the store last week and yet no crash.
Suddenly, it started crashing today whenever the user navigated to map page containing PivotControl for different weather layers.
I don't think this has anything to do with Windows 10 build. I am facing this issue across multiple builds (1803, 1903 & 2004).
Here are my few observations.
It seems that Microsoft has changed something at the service end.