I tried to make pigmen spawn in the overwolrd by breaking the portal an reliting it, but it doesn't seem to work if the portal is or start in a negative Y value. It works whenever the portal is over Y [0] tho. I tried this on different portals with different dimensions
MCPE-164155
Zombie Pigmen don't spawn when nether portal is relit in negative Y
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We're tracking this issue in MCPE-149718, so this ticket is being resolved and linked as a duplicate.
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