Warden still chase to the player's coords, despite the player being in other dimension. The Warden will look up and go to the same coords where the player is in the other dimension.

How to Reproduce

1. Have a second player to see the Warden
2. Build a nether portal or an end portal (make sure you already disabled mob spawning and killed the dragon first)
3. Spawn a Warden
4. Make it angry
5. Go to the portal as quickly as you can
6. Look at the second player's perspective and see the Warden

Observed Result
The Warden will look up and go to the same coords as you in the other dimensions.

Expected Result
The Warden should not go to something that doesn't exist.