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Looks like a deeper bug has been exposed due to the way bclone works? They're finding issues now on ZFS versions predating bclone

Edit: yep, it's an older bug. Set zfs_dmu_offset_next_sync=0 to save your data

Not sure what's your point. The comment I linked to just confirmed that the bug (whichever it might be) has reproduced on FreeBSD.

Just following up for the readers of the thread

Nope, somebody managed to reproduce this issue even with zfs_dmu_offset_next_sync=0

Apply this patch, it appears to be the real fix.