How are your Forwarding and DNS over TLS entries configured? Are you trying to resolve local domains as well?
Now, something has changed according to Unbound Register. The request seems to be forwarded, which is something that did not happen before but, however, the request is not fulfilled, at least not always, because some requests seem to be responded or, at least, I can access the site in Chrome, but most of them not.So, there seems to be some improvement but it is still not working properly.