The most common accepted theory is the hacker changes the ID of the interactables into that of the bloom cores, to which Kaveh can auto detonate with his skill. Then those get saved server side that is why the deletion persists.
That’s the current theory. The Nahida so-called exploit is a made up one. So far Kaveh is the sole holder of the destroyer of the worlds title.
Enjoy the game. I mean, you can still coop with Kaveh enjoyers. This is an actual hack, not a bug. The player doing the deletion are deliberately tinkering stuff on their end to make things go poof maliciously.
Edit: oopsie. MHY already posted stuff. Problem resolved LOL. No primos, sorry