Null route woes in IPv6

[fichtner]

Because I have a /48 range and don't use every possible /64 subnet from it, there is a routing loop between my box and the ISP.

I can create a null route for my IPv6 /48 subnet, but it doesn't get applied.

How to reproduce:

System/Routes/All: Create a route for 2001:1111:1111::/48 to Null6 - ::1
Check System/Routes/Status - no route for 2001:1111:1111::/48 is visible there

Also a traceroute to this destination shows that the default route will be used. In the routing log only this message is visible:

radvd[73122]: sendmsg: Permission denied

In my opinion opnsense should automatically create a null-route for a received PD with a subnet with less than 64 bits, or at least provide an option for this.