Hands up, it looks like despite having waited a long while after the release of 2.3, the add on provider for the content ratings hasn't updated their plugins (they're hoping to release the update this week).Feedback: I do not get the ratings menu when I hover over the "Like" button (Win 11, Norton Private Browser & Firefox).
Lesson for me, double check all plugins explicitly support the new version before an upgrade. One of those obvious in retrospect points.
As soon as the provider has released the update I'll apply it to the site so we can have our ratings back.