Hi, I recently had a problem in SM5, I basically died from a bug or something, let me explain. I made a nether portal and went in there, all normal but after going in, I moved a bit and died instantly for no reason. My things were nowhere to be found, and in my case it was very annoying because I had things that I had a hard time getting and it took me a long time to do it. There are two details to take into account that could be the possible causes of the bug.

1.- I made the portal about 4 blocks away from the edge of the world, in layer 5

2.- Just when I appeared in the nether someone sent me a tp request and I didn't accept it, I just hit the "escape" key and that's when I died