Active target is not serialized after world reload

Mob targets lost their active target after world reload.

For example: Angered wardens sometimes don't roar right after world reload, this allows players to use this bug to sneak away from its pursuit. shortcut

Video:
https://www.youtube.com/watch?v=xzX-pnp1dIQ

Expected results:
Mobs retain their active target after work reload, including checking to see if they are still around.