TURN OFF YesYouKan NOW!
… until @laurent says it is safe to go back in the water.
See also: YesYouKan in Joplin 3.1.20 nuked a non-kanban note, leaving behind YesYouKan stub inside
UPDATE: Laurent responded in that discussion. He has removed it from the repo for now, fixed it, but it will not be ready for us to use until the next release of Joplin.