I've gone through the nether portal and before coming out the other side, I've suffocated to death, that's happened to me twice, I've lost all my gear and do lvls on me because they were stuck in the void. I know that because I've had friends go into get my stuff and can't find it.

on top of that, when they go into the nether to look for my stuff, they end up at the wrong location in the end. One friend went in at say 1k 60 1k in the overworld and ended up 1k 60 1k in the nether, without a nether portal. I've even had one friend end up 10k blocks away in the nether from where the portal was supposed to drop them

also had other friend drown coming back from the end, loosing everything that he had on him. 

This has happened across 2 realms and only after the the latest update. Warnings have been sent out to warn everyone across both realms but we are waiting for a fix.