BROKEN OPNsense 23.1.5_4 sets delegated IPv6 net route interface to lo0

[jeremy.mcmillan]

I can resolve and ping anything from the firewall to the Internet, and it works for a while when I apply any configuration to the LAN interface. Eventually however something glitches and changes the IPv6 delegated 64 bit network route from my LAN interface to LOOPBACK (lo0), thus breaking IPv6 between everything on my LAN to the Internet.

>:(

What should I be logging to figure out where the gremlins are?