PlayerItemConsumeEvent Bug

I am trying to cancel the consumption of golden apples but have encountered a very weird bug...

My code is:

Code:

@EventHandler(ignoreCancelled = true, priority = EventPriority.LOWEST)
    public void appleConsume(PlayerItemConsumeEvent event) {
       
        if(event.getItem().getType() == Material.GOLDEN_APPLE && event.getItem().getData().getData() == 1) {
            event.setCancelled(true);   
        }
    }

It cancels the event fine, but the client then thinks the helmet slot has been replaced by apples for some reason?!



Is it something I am doing wrong, or a bug?

Depending on what slot the apples are in when I eat them seems to change where they appear:



EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

This is a bug I believe, when I made a plugin for this it did the same thing.