FIBs with IPv6

Hey yall, I came across a thread today on the forum regarding an issue with trying to get IPv6 to work on something like a epair interface, I'm having the same issue myself when one end of the epair is assigned to a FIB that differs from the other. I replied to this thread, but it's pending mod. In any case I glossed over the tests of this in /usr/src/tests/sys/netinet6/ndp.sh and proxy_ndp.sh but nothing about them would lead me to believe that they're also testing with a FIB, nothing in the man page would lead me to believe that FIBs have ever been considered with regards to NDP either. IPv4 works fine, I can assign a /31 to both ends of the epair with one interface using a different FIB from the other and both are able to reach each other end to end, and also looking at a packet dump seemed to confirm that with IPv4 ARP is working correctly. I thought I was going crazy for a minute because I remember this exact configuration (or something nearly identical at least) worked for me on OpenBSD. Linux is another story but as I recall if you don't factor in the problems that netfilter adds (like trying to use ct_zones as an after thought for coalescing the identity of a VRF from fwmark) I recall this at least worked as one would expect. I don't really see anything in the git log about FIB for NDP, thing is I can probably create a static NDP entry and make this work, will have to try later but I'm just wondering if maybe this just got overlooked. setfib would seem to be older than NDP but I don't know... looking at ndp.c I'm very unfamiliar with it but it does look like it's querying routing tables at certain points. I'll try turning on debugverbose later and see if anything comes up but I just wanted to mention this just in case this stands out to anybody. Thanks -Paige