Follow-up Comment #5, bug #38677 (project grub):
In the interests of establishing whether there was any possibility of GRUB
being confused by past versions of the VG's metadata, I deactivated the VG
(vgchange -an), dd-ed zeros over the first 1MiB of sda1 and sdb1, and
re-initialized the LVM metadata from a backup (pvcreate --restorefile,
vgcfgrestore).
The problem persists unchanged.
My guesswork following this exercise is that 'grub-probe -t partmap' is only
looking at the device it was asked to discover the partmap type of, and then
running across a codepath which prints a warning because it didn't discover
all PVs in my LVM.
This guesswork is mainly informed by having noticed that running the
grub-probe -t partmap for any LV that is located on pv0 complains about not
finding pv1, and vice versa.
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