Sorry to bump such an old thread, I searched the forum and only found this thread discussing my issue.
I just noticed one of my playlists contain tons of duplicates and don’t see a quick way to remove them. I can manually remove them but would take quite some time as there are 2000 duplicates.
There is no way to automatically remove duplicates. The best option is to right-click or long-press and select each track that is a duplicate and then remove them all at once.