When entering or exiting a dimension I found myself in a mysterious place with no portal nearby. I have had it happen to me 4 times now. the first 2 were from the nether to the overworld, and I was teleported thousands of blocks away without an exit portal. The 3rd time was after I died in the deep end, I went to go grind some XP at my grinder in the end and I spawned underneath an island and fell into the void. Finally, just today I was teleported into a random part of the nether thousands of blocks away when entering a portal in the overworld. I spawn without an exit portal and have to travel, or die in the case of the end, to where I want to go for at least an hour.

The attached picture is my most eastern map with me clearly off it, I'm traveling back to my builds and I have already been traveling for about 30 minutes in new and unexplored nether chunks.