One of the players on my server is crashing when traveling through the nether after hitting a certain point in the world.
When he rejoins the nether doesn't render correctly and he has to teleport back to the overworld to fix it.
Crash Report

On closer inspection, the server is crashing too.
crash-2019-09-14_10.56.04-server.txt

Even though the circumstances under which they happen might at first seem very different, the server crash itself looks very similar to #350.
I'll be looking into the client crash separately at a later time (keeping this issue open as a reminder for that).