Realm crashes and rolls back to last save sometimes repeatedly

MOJANG HOW HARD IT IS TO FIX A DAM BUG. THE REALM CRASHES AND GOES BACK TO THE LAST SAVE AGAIN AND AGAIN. I HAVE LOST SO MUCH PROGRESS ALL BECAUSE YOU STUPID IDIOTS CANT FIX ONE BUG. I FOUND THIS BUG MARKED AS FIXED AND IT ISNT FIXED.