The recipe to craft a grindstone seems to be broken as you can only craft it using an endbrick slab and two warped planks. You cannot craft it with any other slab or plank.
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Thank you for your report!
We're actually already tracking this issue at MCPE-69420, so I will resolve and link this ticket as a duplicate.
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I can craft it with 1 stone slab, 2 stick and 2 every plank