I created a simple UWP application with no code, just XAML.
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This is the support response I got from Microsoft:
Upon investigation, the Bing Maps UWP control was inadvertently unable to handle a certain condition around the tiles. To mitigate this issue, our Product Group has initiated rolling back the change that impacted this experience. This issue should be beginning to resolve within the next hour, if not already.
This issue is now resolved.