At work, OneDrive backs up my documents, photos, and desktop.
Today I created a folder on my desktop, loaded a bunch of files into it, deleted some to get the size right, transferred them to their final destination, then deleted the folder.
And the folder came back. I deleted it, emptied the trash, emptied the OneDrive trash, emptied the second-level trash… and it came back.
I have a script running overnight that deletes it every 10 seconds. Maybe in the morning it'll be gone.