You have to reload and it has partially copied some blocks
However copy and paste does work how duplication did just an added click
I don't like this as. You get the intention you can paste it where you right click and go to paste.
however it past right beside the blocks you have copied
but you can past in to a new screen. but it loads in strange spot correlation to the previous copy
If you want to test this I would advise making a new checkpoint