VRC_Trigger losts targetLocation object when the object hierarchy is changed.
Reproduce steps:
  1. Create target location object.
  2. Create teleportable object. (Create a object, Add VRC_ObjectSync)
  3. Create TeleportTo caller object normally. (Create a object, Add VRC_Trigger, Check AdvancedMode on, Add any trigger, Add SendRPC action, Set teleportable object (of step 2) to reciever, Select TeleportTo method, Set target location object (of step 1) to targetLocation )
  4. Change hierarchy of target location object. (Create parent object. Move target location object as a child of parent object.)
  5. Open VRC_Trigger of caller object again. You will see None in targetLocation field.