Here's another problem:
If my WAN interface In System:Gatways there's always a WAN_DHCP6 gateway is configured for Static IPv4 and DHCP6, then I seemingly can't set IPv4 DNS server entries. If I try, this is what I get:
The following input errors were detected:
The gateway specified for DNS server '220.127.116.11' is not from the same Address Family as gateway ''.
The gateway specified for DNS server '18.104.22.168' is not from the same Address Family as gateway ''
I'd understand this error if the interface were ONLY configured for DHCP6, but why can't I set an IPv4 DNS server on an interface that offers IPv4 traffic???
Heck, even after I set the IPv6 configuration of the WAN interface to "none" and turn off IPv6 in System:Advanced:Networking by unchecking the "Allow IPv6" box, I still get this...