Multi WAN - DNS not working

[enidnabi]

The default is unchecked. In that state, a policy routing rule is active that directs all traffic originating from the firewall to only one WAN interface, overriding the routing table. This setting is the default because it enables a hack, that used to be useful with OPNsense, but I have been unable to figure out what hack that may be. In my setups, I use multi-WAN configurations to reach certain networks via dedicated gateways. So, I activate that setting to deactivate the policy routing to allow services on the firewall to communicate with devices on those certain networks.

Not sure if that setting can also get in the way of multi-WAN setups. When failing over, the policy routing must be changed, too. If it isn't, traffic like DNS queries originating from the firewall will be directed to a gateway that is down. But again, I have never tested this setup.

Has anyone tested how this setting affects multi WAN configurations during failover? I am wondering if leaving it unchecked causes routing conflicts or breaks DNS queries when one gateway goes down.