On Unity editor, after setting up VRC_ObjectSync.TeleportTo action, if you move TeleportTo targetLocation object and reopen SendRPC form, the targetLocation object moves back to previous transform.
Reproduce steps:
  1. Create a object for a target location.
  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 transform (position, lotation, scale) of target location object.
  5. Open SendRPC form of caller object (of step 3) again, as targetLocation field visible.
  6. Then, target location object transform changes as privious step 1.