The Bug:

Using the "/spectate" command across dimensions teleports spectators to the target's position without actually spectating them.

When spectating another player via /spectate <target> <player> the results are very inconsistent and sometimes the player in spectator mode gets stuck.  Other times it works just fine.

What I expected to happen was...:
It should spectate smoothly and view what the other player is doing

What actually happened was...:
The view of the spectator get "stuck" at the original position of the player and it doesnt follow the view.   Its easier to reproduce if they are in two different dimensions but it also happens within the same dimension.

Steps to Reproduce:
1. Have one player in the nether
2. Have a second player in the overworld in spectator mode
3. Run the command /spectate <player in 1> <player in 2>
4. Spectator gets stuck in the original position of the player in 1