"This song is already in your iCloud Music Library." but where tho?

Thanks for responding. This actually doesn't work for me. As you can see in the screenshot below, I have "Display Duplicates" clicked and sorted by song name, where the song I mentioned above does not appear ("OG Luv Kush pt.2" should be between "My Place" and "One for Pops"). In this solution, "Display Duplicates" shows me duplicates based on the Name and Artist fields (which is why I have so many; you may have guessed based on the time stamps in each, but the tracks in the screenshot below are different recordings that just share the same artist). There are, however, no other tracks in my library named "OG Luv Kush pt.2" by "Kaiit" or anyone else, so I can't find where the duplicate is using this method.

Sorry to reopen this, but I spoke too quickly. When I deleted and readded, the issue was resolved for a short while, but then it goes back to how it was originally. Below I've screenshotted how the track appears in my library, with the "date added" timestamp being after I last posted.

You mention above that "Apple Music may also be detecting the same audio fingerprint for songs that slight variations of each other," and I think this is what's happening. But whatever Apple Music thinks is the same fingerprint doesn't have anything resembling the same name, time, or artist name in my library. Do you have any suggestions for how I might otherwise find this duplicate?

This worked! There were no other tracks in my library with the same metadata, but even though I couldn't find the "original" duplicate, deleting and readding fixed it regardless. Thank you.