I made a Zombie Piglin gold farm over 59 blocks from my portal. After a while of grinding I turned off the farm and went through my portal. When I entered it there where about 10 agro Zombie piglin outside my portal waiting to attack me in my nether base. I expected that the Zombie Piglins would at least be calm in the nether but apparently they keep their agro through dimensions. I have no ideo why this happened.