I wanted to transport a friendly NPC (in this case is cow) from one base to another through two Nether Portals. From one base into the Nether and with an another portal from the Nether into the Overworld.

What I expected to happen was...:
I expected the cow would get transported through both Nether Portals.

What actually happened was...:
The cow got transported through the first Nether Portal into the Nether, but it couldn't use the second one. I just could bring the cow back from the Nether to Overworld through the first Netherportal

Steps to Reproduce:
1. Build two Nether Portals: one from Overworld to the Nether and another one back from the Nether into the Overworld
2. Bring a cow from the Overworld into the Nether.
3. Try to use the second Nether Portal to get it back: it won't work
4. Try to use the first Nether Portal (through which the cow came into the Nether): it will work.