Issue with spectating a player when they change dimmensions

Put the summary of the bug you're having here

What I expected to happen was...:
When the entity I was "shadowing" while in spectator went through the portal I would go with them

What actually happened was...:
Firstly didn't work. Secondly when I pressed shift I ended up in a different location

Steps to Reproduce:
1. Click on somone while in spectator
2. have them go through a portal
3. shift out of them