The "auto recipe" for grindstone shows that ANY stone slab (stone brick, andesite, NOT deepslate, etc.) will work in order to craft a grindstone.

However, it shouldn't work, and when you have wood planks AND sticks in your inventory, (which are a part of the recipe), plus ANY stone slab, the auto craft recipe changes to normal stone slab. But only when you have wood planks and sticks in your inventory.

But the false recipe only shows up when you have ANY type of stone slab, (stone brick, andesite, NOT deepslate, etc.) in your inventory without sticks and wood planks. If you have no stone type slabs in your inventory, then the recipe shows up as it should.

This will lead to confusion for players, as it did to myself when I first saw it.

For attachments:

1. Screenshot (786).png - I had wood planks and sticks in my inventory as well as various stone slabs. In this case, the recipe is correct.

2. Screenshot (788).png - I had a single stone brick slab in my inventory. In this case, the recipe is incorrect, the recipe shows that stone brick slab will work to craft a grindstone, but it shouldn't.

3. Screenshot (789).png - I had a single cobblestone slab in my inventory. In this case, the recipe is incorrect, the recipe shows that cobblestone slab will work to craft a grindstone, but it shouldn't.

Screenshots 2 and 3 are just 2 examples of how stones will appear in crafting recipe for grindstone depending on what is in your inventory, although it shouldn't.