Unity Probuilder prefab cause lag/freeze/corrupts

So here's my experience, I created some normal objects in Probuilder, which basically are just merging Spheres and Cylinders together, nothing else, and everything was fine. Next thing I did was make all of those objects become prefabs. First one was normal, the second took a few seconds, a bit laggy you could say, and the third one just took...it never finished. So I made a new, blank project and ran it. Everything's fine, copy all of the things in the bugged project and the editor just fell in a loop of loading and it also never finished. So I checked the "clone" project's file and deleted the prefabs that I made from Probuilder, because that was the last thing I did before all of these things happened, and it works ! Everything turned back to normal and never froze again, unless I tried to make those prefabs again. So why did that happen ? I never know. I have read some close to similar threads such as Unity became slow or frozen loading screen or something...Anyway, I hope this will help anyone who has the same problem as mine.