I found this one by "messing" around. When sleeping under an end portal the game crashes/softlocks in the Loading screen when entering the End. When rejoining the world you get teleported in the End to the coordinates where you slept/where the end portal was. You can see the coordinates -1361 816 there you will get teleported. Then a random nether portal spawns near the stronghold entrance to the portal
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Does this reproduce every time you do that?
What device are you using to test it exactly?

Yeah I tested it at two different strongholds. Im on xbox series x, I think the game cant handle the Situation that the player is entering an end portal and sleeping at the same time. The End Loading screen will appear (see the image) but it never completes and I have to close and reopen minecraft. Then you just get teleported to the coordinates where you slept in the End. When reentering the world another random nether portal spawned near the end portal in the stronghold

Confirmed on Windows 11. However, I was not able to get a Nether portal to spawn. I've attached a world to easily reproduce the issue.

I think the netherportal spawns when reentering the world and then dying in the void. Then you Spawn back at your bed and the portal is there