7.2-STABLE ZFS: mv: set flags (was: 00000000): Invalid argument

[Peter Much]

Hi ZFS gurus!

After upgrading my system from 7.2-PRERELEASE to 7.2-STABLE (as
of last week), and accordingly upgrading my Pools from Version
6 to Version 13, I get this error when moving arbitrary files
between different ZFS filesystems.

While this seems not to do much harm (mv returns with 0), it is
annoying. 
Does anybody know an explanation or fix, or is there some work in
progress?

rgds,
PMc