Do you have "Request only a prefix" unset? It would be better to set this option if that's the case. If it's already set we need to try and ignore this zero lifetime NA that doesn't even provide an address.
Robert,As per my earlier comments I wrote this patch to try https://github.com/opnsense/dhcp6c/commit/d2e5fb474f# pkg add -f https://pkg.opnsense.org/FreeBSD:14:amd64/snapshots/misc/dhcp6c-20240907_3.pkgReboot to see if it helps.Thanks,Franco
Still no specialist in that topic, but I think the pattern of the log changed somewhat since 24.7.3.
It seems to have completely fixed my case. A prefix, (with an address for the interface itself) is picked up immediately, similar to pre 24.7.4. If you want anything else tested, I will probably be available.