Does FreeBSD 13 disable the VEV cache in ZFS ?

[Pete French]

Am just upgrading my machiens, and have noticed an oddity.
This is on a machine runnign 12.2

# zfs-stats -D

------------------------------------------------------------------------
ZFS Subsystem Report				Fri May 14 08:30:50 2021
------------------------------------------------------------------------

VDEV Cache Summary:				88.31	m
	Hit Ratio:			31.20%	27.55	m
	Miss Ratio:			68.48%	60.47	m
	Delegations:			0.32%	284.97	k

------------------------------------------------------------------------


This is on a machine running 13.0

# zfs-stats -D

------------------------------------------------------------------------
ZFS Subsystem Report				Fri May 14 08:32:18 2021
------------------------------------------------------------------------

VDEV cache is disabled

------------------------------------------------------------------------


Same config on both. So, is it really disabled, or is zfs-stats getting this
wrong for some reason ? I cant find any refernbce to this in the release notes
or by googling.

-pete.