FRR ospf6 and bridge interfaces.

So... I have FRR OSPF and OSPF6 up on my lan.  As I've got a few VMs that
(say) act as a VPN sever, I want OSPF and OSPF6 to pick up from the bridge
that serves the VMs.

Both OSPF and OSPF6 work fine on the physical lan interfaces (in fact, on
vlan interfaces that attach to regular lan interfaces).  I'm also familiar
with the rules for OSPF[6] matching the configuration, network and network
length.

But having configured the VM and the host OSPF --- which works fine and
OSPF6 ... which doesn't, I think dumped traffic on the bridge.

no OSPF6 packets on the bridge.  IPV6 pings work.  Host and VM are both
13.1-RELEASE.