World becomes unplayable after quitting (not always) on death

I've noticed on two of my worlds after I have rage quit after dying on my first world, the world became unplayable, so much so that I had to delete it and make a new one. Now the problem persists as now when I try loading into my other world (that I have put quite a bit of time into) now infinitely says "building terrain" nothing I can do except close the application... this bug is completely game breaking, and needs to be dealt with. Thank you very much for listening.