TrueNAS 12.0-U1.1 Hot Fix For Potentially Critical ZFS issue

I watched this when it came out, and think I know the answer but not certain:

If I originally built the NAS on 11.x or even 9.x and have upgrade up to 12.x, but I haven’t updated to the new ZFS flags, am I still vulnerable?

Going to patch anyway, but thought it was worth asking.

I am not completely clear on that either.