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
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Thank you for your report!
We're actually already tracking this issue in MC-151648, so I resolved and linked this ticket as a duplicate.
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Thanks!

I've just find a solution (appart from killing him and summon an other one in the overworld), you cant put a command block in the nether and type in "tp @e[type=minecraft:panda] <a player in the overworld name's>" and when you trigger it, every panda in the nether go straight to the overworld...