I encountered a weird bug while playing today. I was in the nether realm and accidentally fell in the lava and caught on fire. I was low on health so I ran through the portal before the ghasts could kill me. It took a while to load the overworld and when it finally loaded I was dead. I hit the respawn button but nothing happened. I kept hitting the respawn button but nothing was happening. I couldn't do anything so I was forced to open the task manager and shut down the game and restart it.

When I got back into the game there were several copies of my character standing next to the nether portal. It was night time and a zombie spawned and began attacking one of my copies. I took damage when my copy was being hit and eventually I died. This kept happening until all my copies were dead.

I have not been able to reproduce this bug.