Problems with BlockFromToEvent

I am trying to slow down lava movement with the BlockFromToEvent This code just stops lava completely

Code:java

 
   public HashMap<Location, Integer> Blocks = new HashMap<Location, Integer>();
   @EventHandler
    public void LavaFlow(BlockPhysicsEvent event)
    {
        if(Blocks.containsKey(event.getBlock().getLocation()))
        {
            if(Blocks.get(event.getBlock().getLocation()) == 4)
            {
                Blocks.remove(event.getBlock().getLocation());
            }
            else
            {
                Blocks.put(event.getBlock().getLocation(), Blocks.get(event.getBlock().getLocation()) + 1 );
                event.setCancelled(true);
            }
        }
        else
        {
            Blocks.put(event.getBlock().getLocation(), 1);
            event.setCancelled(true);
        }

 

welsar55 I'm not 100% sure about this, but you might need to give the lava a BlockUpdate to check if it can flow again. Also, your title says "BlockFromToEvent", but you are actually having an issue with the "BlockPhysicsEvent" and aren't even using the "BlockFromToEvent".

 

masons123456 Your right my bad I was testing to see if Block Physics worked but it did not.