Updated my WNDRMACv2/WNDR3800 from 22.03.5 to this and so far have seen only one oddity, which is the syslog populating with messages like:
daemon.warn odhcpd[1501]: No default route present, overriding ra_lifetime!
But I found the answer to that here:
Unclear why it didn't turn up in v22, but maybe those changes hadn't been checked in on my router. The answer, as mentioned in the thread, is disabling a few more IPv6 things in the LAN's DHCP Server.