Panda's can't go through nether portals

I tried bringing a panda from a far forest to my base using nether portals, It was fine and worked when the panda went from the overworld to the nether but when I try to bring it back to the overworld in a different location it won't work. The panda just stays inside the portal. Some information about the two portals

-They're both on top of the nether roof

-They're around 1K blocks away