"Spooky Scary Skeleton" (nether/get_wither_skull.json) advancement tests for blaze rod instead of wither skull

The bug

The advancement "Spooky Scary Skeleton" (nether/get_wither_skull.json) tests for a blaze rod instead of a wither skull.

nether/get_wither_skull.json

{
    "display": {
        "icon": {
            "item": "minecraft:skull",
            "data": 1
        },
        "title": "Spooky Scary Skeleton",
        "description": "Obtain a wither skeleton's skull"
    },
    "parent": "minecraft:nether/find_fortress",
    "criteria": {
        "wither_skull": {
            "trigger": "minecraft:inventory_changed",
            "conditions": {
                "items": [
                    {
                        "item": "minecraft:blaze_rod"
                    }
                ]
            }
        }
    }
}