Cannot resolve SRV records: unknown host

The Bug

Starting in 21w19a, some server addresses cannot be resolved from the client multiplayer server list.

Observations

Any SRV record does not resolve, however any CNAME record works as intented.

How to reproduce

1. Add play.articdive.de to your server list (SRV record)
   -> no domain resolution.
2. Edit the server address by using dynamic.articdive.de (CNAME record that the previous should should point to.
   -> domain is resolved.