This issue has been identified and will be fixed in the next release.
http://forum.mikrotik.com/t/v7-16-2-stable-is-released/178911/1
And:
SUP-165334 [7.16rc4] Unexpected dns (resolve) behavior
:resolve server= should bypass cache and send the query directly to server. Instead, version 7.16rc returns the value from cache.
A direct result of this is that The Dude will unexpectedly detect dns services on all hosts connected to the affected (7.16rc4) agent.
The issue has been reproduced, we look forward to fixing it on upcoming RouterOS versions.
Edit:
What’s new in 7.16.1 (2024-Oct-10 17:03):
*) dns - do not look up local cache when executing “:resolve” command with specified “server” parameter (introduced in v7.16);