I can't make greatwood slabs the recipe gives oak slabs
Following up on this... it looks like the recipe for oak slabs will take ANY kind of wood whatsoever, so this could be an issue regardless of wood type.
It's definitely a larger issue with the Greatwood slabs though, since you may find it difficult to craft the thaumcraft tables without them.
edit: [For clarity] I've observed this bug with the Greatwood planks -> slabs recipe. I haven't seen it with any other wood type yet.
edit2: This seems only to affect only the Witchery and Thaumcraft trees, and the fireproof version of forestry planks (though there is no fireproof slab version).
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