Thanks for the updates everyone. It's still happening to me with version:
10.67.4-mac-ddl-public (20231204112355)
Editor: v176.32.0
Service: v1.80.3
But not on all notes. From the ones that had updated in error the other day, only two, when I clicked on them now, updated again to the current date/time. Strangely enough when I look at their version history, they are showing a version from 2022 (when they were created), then as of few moments ago, but no version from 2 days ago when this first occured. When I look at some that changed 2 days ago, but not changing today, it's a mix of history of either only version from Dec 2, or Dec plus some older versions.
I tried few old notes where I would not care if updated date changed, and sure it did on one of them. Its version history has nothing other than "few seconds ago" and "current version". The note is from 2012, and it does not have any images (although it has a URL link in the text, and URL in the note properties).