Minecraft wiki entry for Zombified_piglin_farming, associated text: One fundamental problem with Overworld gold farms is that it is occasionally possible for angered ZPs to return to the Nether through a portal, and perhaps anger others while there. Without proper precautions, you may be ambushed by one or more angry ZPs when they return to the Nether though a nearby portal. You will need to make sure that all your farm portals lead into a containment area where the ZPs will be isolated. This area should have enough room for any mobs there to get away from the portal for their 15 second cooldown, so that they can then go back to the Overworld. (Also include a fence-gate exit, just in case you stumble in yourself!) Similarly, one must be careful not to use a portal in the Nether which takes them into the farm for the same reason. Returnees can be minimized by use of turtle eggs to lure zombified piglins out of the portals. This ensures they will move and fall even without players nearby.