Add item to player inventory

Issue description

So I was making a trader mob that put an item into the players inventory but because of the sourceentity procedure changes, it seems tht adding ban item to the inventory adds it to the mob's inventory instead of the player's

Issue comments

how to add a block or item in that red square thing
i want to make a ranged item that when you use it 
it will put something in the inventory of the player that got hit