Transaction event issues

For some reason, this code doesn't do anything. No internal error nor does it do anything. How do I fix it?

Thats the code ->

public function onInventoryTransaction(InventoryTransactionEvent $event) : void{
$transaction = $event->getTransaction();
$player = $transaction->getSource();
$inv = $player->getInventory();
if (count($actions) === 2) {
$actions = array_values($transaction->getActions());
foreach ($actions as $i => $action) {
$item = Item::get(373, 0, 1);
$eye = Item::get(351, 0, 1);
$stick = Item::get(280, 0, 1);
if ($action instanceof SlotChangeAction && ($otherAction = $actions[($i + 1) % 2]) instanceof SlotChangeAction && ($itemClickedWith = $action->getTargetItem())->getId() === $eye && ($itemClicked = $action->getSourceItem())->getId() !== ItemIds::AIR) {
$player->sendMessage("Unable to craft this item");
$mergeSuccessful = false;
if ($itemClicked == $eye) {
$inv->removeItem($item);
$action->getInventory()->setItem($action->getSlot(), $stick);
$player->sendMessage("§7(§a!§7) §aYou have crafted an awkward potion");
$mergeSuccessful = true;
}
if ($mergeSuccessful) {
$event->setCancelled();
$otherAction->getInventory()->setItem($otherAction->getSlot(), Item::get(Item::AIR));
}
}
}
}
}

 

Try adding some log messages to see how far the code reaches $this->getLogger()->info("got here");