I built a wither skeleton farm that uses portals to move the skeletons to the overworld and then back to the nether roof. The farm works great when I had the world as a single player setup on my local computer. I moved the world to a Paper MC server so I could enable some plugins and am still only playing single player but now on a server. Since the move the farm no longer works.
Do portal based farms simply not work on servers? Do I need to somehow chunk load the portals in the overworld to allow the skeletons to come through?