Can't tell, the game lets you choose if yes or not you want to keep the original ownership when pasting a blueprint. I updated the blueprint, I presume and hope the huge thumbnail has something to do with the issue. If the problem still persist, can you send me the log file of the session where you tried to load the blueprint?

I think it's a "changed ownership" problem, maybe setting every block to Nobody would do something?
But if you don't set a script, it's a non-issue anyway lol

I don't change the default script inside PBs to let people use their own. After the recent update there's an option in the admin panel which prevent printing from projectors by default, but the fact it does not paste in creative is strange and I can't reproduce this issue even by loading the bp from the workshop :/

What script do you normally put in the PB? It doesn't print in projector, nor paste in creative :'(