I don't know how this happened. I was playing vanilla Minecraft and my nether portal took me to the same coordinates in nether as I was in the overworld, instead of the already generated nether portal.
MC-188373
Nether portal teleport
Resolved
Invalid
0
Thank you for your report!
However, this issue is Invalid.
This is a bug tracker, not a support page. Please read the wiki article about how nether portals link: https://minecraft.gamepedia.com/Nether_portal#Portal_linkage_between_Overworld_and_Nether
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