So I was just playing the game and i suddenly saw something that wasnt supposed to be there. It was like something that was supposed to be spawned in the nether
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This is a feature of the new Nether Updates.
For more information see https://minecraft.gamepedia.com/Ruined_Portal
No, this is normal. If you're using the experimental version of Minecraft, you're seeing the soon-to-be-added ruined portals. These generate in the nether and the overworld. Congrats on finding one!