Crafting Duplicate from quick shot dispenser

If you put item in dispenser with redstone tick, then you shot that items continously and you crafting that item can craft into block like diamond, redstone, coal, iron, etc.
you can duplicate that item, so technically when items in your inventory keep increase, you can craft that item to block of (ex.diamond), but minecraft can't read clearly how much is that item because is keep increase, so the result is that item will not reduced,
if this isn't too obvious, you can watch the video.
This bug caused many problems in our realm, I hope you can fix it as soon as possible in the next update. Thank you