Death in nether portal prevents respawn

The bug

I was playing on a friend's survival server when I died whilst traveling through a nether portal. Clicking respawn pressed down the button but after that, nothing changed. I ended up disconnecting and reconnected, upon which I appeared at my spawn next to myself. At this point, the server admin noticed that I appeared to be logged into the server twice.

In the past when this has occurred, the ghost version of me eventually disconnected, or something to that effect, but this time I had to log off before that happened. I logged in this morning to find that I was not where I had logged off, but at my spawn, with an empty inventory.