"Convert to new format" spins forever

"Convert to new format" spins forever

I've got some notes that show this popup when I try to open them in the Android app:

First off, I'm not sure how they got created that way, since I never used the old editor. Maybe through the clipper? But whatever.
The real problem is that when I press "CONVERT TO NEW FORMAT", the app just gives me a busy cursor and never finishes converting the note. If I press the back button and wait long enough, it will eventually go back to the notes list, but the note hadn't been converted.