Tool for detecting and removing duplicates? [Available in 8.10.18]

We've been raising this problem for many years. 1Password refuses to allow a cleanup duplicates tool (they allowed a very limited one in 1Password 7, then abandoned it upon release of 8.) New staff members pop up here every few years, and say they will suggest it to the development team. I've been using 1Password since the beginning. I acquired 6,000 duplicates when they switched to subscription for 1Pass6, and have been manually deleting one-at-a-time ever since - down to 3,300 now!!

I'm hoping to ditch this crappy company when I can -- they abandoned me years ago. Their goal is to lock you to their ecosystem, while pretending to be good guys :-( Luckily Apple and Google are stepping up their game.