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Bug
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Resolution: Works As Intended
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None
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1.21
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None
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Unconfirmed
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(Unassigned)
Mobs that go through nether portals in the nether or the overworld will generate new portals on the other side if the portal they are going through isn't linked. In older versions (for example 1.20.4) this was not the case.
To recreate this, you can go in a new world, or go far away on a world, so the portal can't link to any portal that you made. After that you can throw an item, then go to where the portal would generate in the other dimension (not going through this portal) and see that a new portal was generated without the player using the original portal.