Cannot Delete Cloned Base World

First, it doesn't give me the confirmation to delete dialog box right away as expected. I have to click Delete from the menu twice for that message to appear, then when I finally confirm my deletion I get an error message. See video here:
https://discord.com/channels/1087479995083018372/1092257107300069557/1225950307842789396

It's taking up one of my allowed base world slots...