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bbfa235
(Get the code!)
Let me correct my last comment.
1) In scenario 1, grub-probe -v -t fs / shows the message preceding the error is "opening (gptvg-lvroot)"
2) In scenario 2, grub-probe -v -t fs /data shows the message preceding the error is "opening (gptvg-lvdata)"
If I replace -t fs with -t partmap in the commands above, the result is the same. So it seems that for grub-probe discovering the partition map is an interim step to discovering the filesystem type, and that's where the problem is.