If you save and quit your game (or the you offload the game or it crashes) and you are in the nether when it happened, when you rejoin the world you will spawn in the overworld in a random location +/- 1000 blocks x and z from 0 0. 

When you save and quit in the nether you are supposed to spawn back in the nether where you last were logged in just like in the overworld. 

How to reproduce

1. Go into the nether
2. Save and quit the game
3. Rejoin the world
4. Find yourself in a random location in the overworld

I would attach a video of this occurring but due to this sites absolutely insane 3 second video limit I can’t add it. If you would like a video please contact me on Discord @ Amphy#9133. If you are a mod, increasing the 3 second limit would be highly appreciated and needed too as it’s impossible to show any glitches with such a tiny limit. 

Also as a sidenote it would be highly useful to both me as the bug reporter and you as the bug moderators to add iPadOS to the list of platforms since Apple has recently separated the iPads from iOS and created iPadOS. There are a few bugs that I have seen reported here that are exclusive to iPadOS since it’s been separated