zpool upgrade can't enable new features

[John Kennedy]

On Thu, Feb 25, 2021 at 11:09:17AM -0300, Renato Botelho wrote:
> I recently upgraded a CURRENT system to main-n244932-248a47a4c2f and 
> zpool status shows:
> 
>    pool: zroot
>   state: ONLINE
> status: Some supported and requested features are not enabled on the pool.
>          The pool can still be used, but some features are unavailable.
> action: Enable all features using 'zpool upgrade'. Once this is done,
>          the pool may no longer be accessible by software that does not support
>          the features. See zpool-features(5) for details.

  I noticed that the other day with main-n245037-6e822e99570f.

	  pool: zroot
	 state: ONLINE
	status: Some supported and requested features are not enabled on the pool.
	        The pool can still be used, but some features are unavailable.
	action: Enable all features using 'zpool upgrade'. Once this is done,
	        the pool may no longer be accessible by software that does not support
	        the features. See zpool-features(5) for details.
	  scan: scrub repaired 0B in 00:01:10 with 0 errors on Mon Feb  1 18:34:43 2021
	config:

	        NAME           STATE     READ WRITE CKSUM
	        zroot          ONLINE       0     0     0
	          vtbd0p3.eli  ONLINE       0     0     0

  I didn't see anything at all that seemed missing.

	zpool get all zroot | grep feature | sed -E 's/^([^ ]+)[ ]+([^ ]+)[ ]+([^ ]+)[ ]+([^ ]+).*$/\1 \3 \4/' | sort | uniq -c
	  12 zroot active local
	  21 zroot enabled local