Cancel a block drop in 1.15.2

Hi,
I've a problem : I want to cancel a block drop.
If I'm ask here, that because all of solutions don't working. I've tried in the BlockBreakEvent :

• e.setDropItems(false) : ineffective.
• e.getBlock().setType(Material.AIR) : ineffective.

I've tried in BlockDropItemEvent too, but not more effective...

Do you have a solution ? Thanks !
(btw, like the title says : I'm in 1.15.2)
(btw 2 sorry for my english, I'm french)

 

Ok, so, I want to cancel the drop of a furnace.
For my code, I use a custom block manager, but i think that's not the problem :

Code:

    @EventHandler
    public void breakBlock(BlockBreakEvent e){
        if(plugin.getBlockManager().getBlocks().containsKey(e.getBlock().getLocation())){
            e.getPlayer().sendMessage("you break a known block");
            e.getBlock().setType(Material.AIR);
            plugin.getBlockManager().dropBlock(e.getBlock().getLocation());
            plugin.getBlockManager().removeBlock(e.getBlock().getLocation());
        }
    }

For infos, the message is sent ! this is only the setType() line (btw, now, with this method, the drop is not effective) that's cause problems

 

I just re-try this method and it's doesn't work. Like the 3rd line does'nt work. Nothing in the console.

 

I'll try this

Edit : @timtower It's doen't working... With the setBlock type to AIR, the custom drop doen't appear, and thez regular furnace still drop

 

Cancel the event and the set the type of the block to air

 

@timtower

Code:

           plugin.getBlockManager().dropBlock(e.getBlock().getLocation());
            e.getBlock().setType(Material.AIR);
            plugin.getBlockManager().removeBlock(e.getBlock().getLocation());

@gochi9
It doesn't working anymore

 

Ok so by canceling the event i meant e.setCancelled(true); and then setting the
e.getBlock().setType(Material.AIR);

Code:

if(plugin.getBlockManager().getBlocks().containsKey(e.getBlock().getLocation())){
            ev.setCancelled(true);
            e.getBlock().setType(Material.AIR);
            ev.getPlayer().sendMessage("you break a known block");

        }

This should work just fine if you want to break the block without getting the drop