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We are having some issues with DNS records getting lost when using DHCP and "Register DHCP leases".
The problem is that if the clients have been off for a while, the lease expires and the DNS record is gone (as expected). When those PC's are then started again, they get a new DHCP lease, but no DNS record. Restarting the DNS service makes them all appear again.

We were first using Unbound DNS, and then tried switching to Dnsmasq in case the issue was in Unbound.
Both Unbound and Dnsmasq are set up with both "Register DHCP leases" and "Register DHCP static mappings".

If all PC's are set to use static DHCP lease this problem goes away, so we can work around it, but we would prefer to be using dynamic lease.

At the moment 24.1.2 is in use, but we have seen this problem since the system was set up in September.

Our system has multiple opnsense routers which all have this issue, and none of them are internet facing. They all use another opnsense edge router for internet access.

Any idea what could be causing this?

Any ides on how I should go forward to get this working again?

Also, it does actually seem to be mentioned before:
https://github.com/opnsense/core/issues/3531#issuecomment-517983520

Any ideas of what could have happened? I haven't changed any settings, and it was previously working fine.
I don't have any systems rely on IPv6, so I don't know how long since it stopped working.

Is there any more information I can provide to see where the issue might be?

Has something happened to 6rd support? I'm now on 19.7.3 and I can't get it to work any more.
It worked fine before, but I don't think it has worked at all for me on 19.7.

Pinging ipv6.google.com all I get is: ping6: UDP connect: No route to host