I don't think this is a Calibre (fixable) issue.
I have never had a AZW3 file fail to reopen (on the same device).
The only time I have had a fail, is I renamed the book , thus it was treated as a different book. The old one (if not deleted-restored) still opened properly
How are you sending the book?
Have you restarted (rebooted) your device?
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