Unbound on buster

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Have run pihole for a while. Recently installed unbound following the instructions at unbound - Pi-hole documentation and pihole, dig etc all apparently work fine. The target Pi runs Rasbian Buster, so I didn't do the Disable resolvconf.conf bit at the end as I thought it wasn't applicable.

Expected Behaviour:

Working DNS resolver.

Actual Behaviour:

Working DNS resolver, BUT the /etc/resolv.conf file contains nameserver 127.0.0.1 without a 5335 port, which I understood from the article to be the symptom of the confg error. Should I worry about this?

Debug Token:

N/A

No. The loopback IP goes to the Pi-hole, which in turn routes the DNS queries to unbound.