Server ID : S251
Character Name : Amaterasu
UID : 200000094275627
Bug Location : In Fights while using Hidan + Life Drain
How Did It Happen? : Was Testing if Hidan's mystery can out heal his suicide with life drain
Bug Description : Was Trying Ninja exam when a bug happened using hidan , when hidan is lower hp than his Mystery that his myster will kill him , but he Life drain enough to keep him alive again , he becomes a zombie , reviving 2 rounds later applying his passive to heal him back , while staying alive during those 2 rounds and attacking

Video : https://www.youtube.com/watch?v=vH93mLrvDp4&feature=youtu.be
Edit : I discovered it before the new patch , however i tested again and it still exists , you can double check if you want :P