PTR In log errors

I have 2 servers set up with Technitium. They are not related - BUT one server is running Ubuntu 24.04 and the other is running Debian 12

Both of them resolve clients connecting through a WireGuard tunnel. The VPS running Ubuntu Server has no problems at all. For some reason the one running Debian 12 keeps giving me these server errors:

“DNS Server failed to resolve the request '2.66.66.10.in-addr.arpa. PTR IN'”

I have a feeling this is on me since I’m new to networking and I probably don’t have something set up correctly. Despite Debian and Ubuntu being closely related, I have noticed a few config differences between the 2.

Anyways, I set up a PTR zone for 10.66.66.0/24 and it seems to have made the “server errors” go away. I just wanted check and see if this was a legitimate way to solve the problem or is there something deeper going on that I need to investigate?

Edit: this has made the errors go away but eventually this will be a “semi-public” resolver so I’m not sure if the way I did it is safe or not