So I was playing on my survival world, I entered an Overworld Nether Portal while autosaving (Show Autosave Icon was on), and put me on the overworld coordinates in the nether. For example, you have an overworld portal on x = 1000, y = 40, z = 10, and entered it while autosaving, you will be placed on the nether with the overworld coordinates.

REPLICATION STEPS:

1. Turn on Show Autosave Icon, this will give you visual that your autosaving
2. Go in a world and make a overworld portal (I reccomend placing it around 1000 on the x and/or z coordinates)
3. Once you see that your autosaving (a chest with a down arrow will appear on the top left), enter the portal
4. After entering, you should be on the coordinates of the overworld in the nether.