Unbound + Bind9 = locally not resolving but externally it does

[opnserious]

Dear opnsense community,

I recently created an Bind9 Authoratative namserver VM to serve my domain names all on the same IP address. Now, when I resolve the domain names from outside my network I can resolve them and dig NS example.com also works. However, when I am on my local network I cannot resolve the domain names that are globally routable. This happens when I choose unbound to be my DNS upstream. When I change the DNS upstream to 1.1.1.1 for instance then it does resolve the domain names served by Bind9 again. All other domain names are perfectly resolved by the Unbound DNS resolver, only not my applications that I host locally but are exposed externally by Bind9. Maybe someone knows, what kind of settings i should adjust to locally resolve my domain names as well.

Cheers,

Dennis