Function not working to get more items

    {
        "function": "minecraft:filtered",
        "item_filter": {
            "items": "minecraft:quartz_block"
        },
        "modifier": {
            "function": "minecraft:set_item",
            "item": "minecraft:quartz",
            "count": 4
        }
    }

I am trying to make a datapack that if certain items are dropped onto a stonecutter, they will uncraft. So for this one I am trying to get a quartz block to turn into 4 nether quartz, but its just going one singular nether quartz