What I expected to happen was: I could use nether portals to teleport between dimensions easily without "rubber-banding" or dieing.

When creating a portal on my private snapshot server, I teleported through the portal and after trying to come back to the overworld, I could not escape the portal. I was "rubber banded" back to the portal and teleported back and forth through dimensions. Note that this does not occur every time I use the portal, but the majority times I have tried. I created another portal in the nether to teleport to the spawn and a similar issue occured, but this time, every teleport made me suffocate and lose about a heart until death. Also, logging out does not make it better, on the first issue that I described, when I logged out and logged back in, I was dropped in a random location in the nether, losing all of my items.

Steps to reproduce- Create portal in survival mode and go through it.

Video showing bug: https://youtu.be/2uHRZCbyomo