[Bug 253469] IPv6 default route vanishes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253469

            Bug ID: 253469
           Summary: IPv6 default route vanishes
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: courtney.hicks1 at icloud.com

I'm not sure where to begin with this issue, but I'm noticing a strange
behavior with IPv6 on FreeBSD 13.0-BETA1. Not sure if it's my driver or an
issue with FreeBSD 13.0 itself. It seems after moments of IPv6 routing properly
it suddenly stops. I found out what is missing when it's working and when it
isn't.

For one, I use RTSOL to get my IPv6 address. So I have the rtsold daemon
running. Once IPv6 routing stops working, I can restart the daemon and routing
works again, albeit momentarily. When I run netstat -r when IPv6 routing
doesn't work:

Internet6:
Destination        Gateway            Flags     Netif Expire
dead:beef:x:x::    link#1             U           re0
fe80::%re0/64      link#1             U           re0

And when it works

Internet6:
Destination        Gateway            Flags     Netif Expire
default            fe80::1:1%re0      UG          re0 
dead:beef:x:x::    link#1             U           re0 
fe80::%re0/64      link#1             U           re0 

I left out my loopback info, I can add it if necessary. So for whatever reason
(and nothing shows in the logs), the default route vanishes for IPv6. During
this time I still have my address and I can still ping6 hosts internally.

uname -a
FreeBSD towerDefense 13.0-BETA1 FreeBSD 13.0-BETA1 #8 c48cbd025: Wed Feb 10
10:30:48 PST 2021    
root at towerDefense:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64


I also compiled the realtek-re-kmod port to get networking.

Intel Z490 motherboard, Intel 10700k. Here is my ethernet info from pciconf

re0 at pci0:2:0:0: class=0x020000 rev=0x04 hdr=0x00 vendor=0x10ec device=0x8125
subvendor=0x1462 subdevice=0x7c75
    vendor     = 'Realtek Semiconductor Co., Ltd.'
    device     = 'RTL8125 2.5GbE Controller'
    class      = network
    subclass   = ethernet

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