It’d depend on how favorable your Mazda dealer’s report is, and how good his / her mood is at the time when the rep at Mazda North American Operations is facing the case.
Honestly, with only 900 miles and 3 weeks old on your 2021 CX-5 GTR, I’d be surprised if your exploding moonroof doesn’t get covered under warranty unless your dealer found obvious evidence of hitting by the foreign object like this which was happened last night in DFW area:
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is there anyone at Mazda Corp I should be contacting in the meantime?