I was testing the new advancements and I noticed something. I wanted to make it so there are 3 different stages to making a beacon. First layer (normal), second layer (2 high + beacon on top) and so on.

There are advancements that overlap other advancements because the game doesn't know where to put it otherwise.

When a advancement branches out into 3 other advancements it will place one right next to it and the other two above and below it. It ignores that advancement that is below/above it.

''Schermopname (40)'' shows the nether wart advancement.
''Schermopname (41)'' shows that the nether wart advancement is overlapped by a beacon advancement.

Let's look at the file that makes the glass bottle: The parent shows that the beacon is not the previous tier

{
    "display": {
"icon": "minecraft:glass_bottle",
        "title": "Brew a Potion",
		"frame": "challenge"
    },
    "parent": "minecraft:nether/get_netherwart",
    "criteria": {
        "potion": {
            "trigger": "minecraft:inventory_changed",
            "conditions": {
                "items": [
                    {
                        "item": "minecraft:potion"
                    }
                ]
            }
        }
    }
}