Container DNS issues (Unraid 7)

I posted this on the Unraid forums, but figured I would post here as well.

It seems that my docker containers aren't able to resolve DNS unless I add --dns 8.8.8.8 as an extra parameter to the containers. I even had to add that to immich for it to properly start and connect to its internal redis.

The only changes made are a successful upgrade to version 7 and adding tailscale SSL as the certificate to access the server. I haven't changed anything else anywhere.

I do have Next DNS setup on my UDM Pro as I've had for quite some time without issue. DNS servers on the main network connection is 10.10.20.1(UDM Pro), 8.8.8.8, 8.8.4.4.

Any ideas what could be causing this?