Follow-up Comment #2, bug #64167 (project grub):
I suspect you've hit this bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987008
https://savannah.gnu.org/bugs/?61620
I've hit this issue myself and, having done a similar round of debugging, I'm
also pretty sure grub is broken in the case where the LVM metadata isn't
contiguous on-disk, which means that any LVM operation that touches the
metadata could trigger this bug.
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