Greetings NotActuallyPete,
It looks like you're having some issues when you Love or dislike songs in Music on Mac - Apple Support.
You can love a song or album so that you can easily find and play it again later. If you dislike a song or album, you receive fewer suggestions for similar music.
If that is the case, we have a few steps to try to help with isolating and resolving the issue.
Restart your Mac by following these steps: Shut down or restart your Mac - Apple Support. Often this simple step will refresh the apps and software on the device to solve numerous problems you may encounter.
Check to see if the issue happens with a specific user on your Mac. If you do not have an alternate user you may need to create one to test with. Here's more information on that process: Change Users & Groups settings on Mac - Apple Support.
Does the issue happen when you set a preference from a specific device? If you have a different Apple device that uses the same Apple ID and Apple Music, check to see if it exhibits the same behavior when you Love or Dislike music in Apple Music.
This information can help determine the cause of the issue. Return to this post with your results so we can help with more steps toward a solution as needed.
Cheers!