InventoryTransactionPacket Problem

How can I get target in InventoryTransactionPacket like before in InteractPacket

 

PHP:

use pocketmine\network\mcpe\protocol\InventoryTransactionPacket;

public function DataPacketReceive(DataPacketReceiveEvent $event) {
  $pk = $event->getPacket();
  if($pk instanceof InventoryTransactionPacket){
    if($pk->transactionType === InventoryTransactionPacket::TYPE_USE_ITEM_ON_ENTITY){
      if($pk->trData->actionType === InventoryTransactionPacket::USE_ITEM_ON_ENTITY_ACTION_INTERACT){
        $data = $pk->trData;
        $itemUsedOnEntity = $data->itemInHand;
        $entityId = $data->entityRuntimeId;
        $vector1 = $data->vector1; // what are those?!
        $vector2 = $data->vector2; // what are those?! are these meant to be player and entity positions?
        //code
      }
    }
  }
}