Petrifried oak slab isn't under #non_flammable_wood in creative menu

Can confirm in 21w03a.

Can confirm in 21w05b.

Can confirm in 21w06a.

Can confirm in 21w07a.

This was fixed with the removal of the slab from the creative inventory

Well, not exactly fixed, it still doesn't show up; I'd say invalid or won't fix is a better resolution.

The tag is also still not on the item, so perhaps the report should be changed slightly to signify that's the issue, not search in creative. (Using the tag in /clear still doesn't clear it.)