Ok, so I found that apparently is an expected log entry, and so the alert was downgraded from warn to debug in August 2019. https://issues.apache.org/jira/browse/SLING-8637

That is most likely a red herring; a false lead. It is just likely another instance of the same error. I say this from 3-4 years experience in living with this error on just about every GET request that has anything to do with the editable templates. It is still happening in 6.5.3 too. Same error (pointing to same settings path) will present on non-template items too, such as:/libs/wcm/core/content/pageinfo.json/content/versionhistory.thumb.48.48.png/favicon.ico/etc/tags/marketing.infinity.jsonI...