When a Vex that has been summoned by an Evoker goes through a portal, it will go to the coordinates of the Evoker in the dimension it was in (exemple : overworld x-50 y58 z50 -> nether x-50 y58 z50).
Steps to reproduce the bug :
Put/spawn an Evoker next to a portal (nether or end).
Make the Evoker spawn Vex by going in survival or putting a villager next.
Make Vex go though the portal by either letting it fly around or attracting it.
Follow the Vex through and after the portal.
Expected behavior :
Vex would wander after going into the other dimension if they don't find a target.
Actual/observed behavior :
Vex goes to the Evoker's coordinates of the dimension it was in (exemple : overworld x-50 y58 z50 -> nether x-50 y58 z50) in an attempt to stay by the Evoker's sides if it doesn't have a target.
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Thank you for your report!
We're tracking this issue in MC-153607, so this ticket is being resolved and linked as a duplicate.
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To fix this, the vex simply needs to store the dimension its "bound position" is in, scale the values when it travels between dimensions, or simply disallow it traveling through portals.