Coal Block appears grey on maps

Stone-type blocks show up grey. This includes sandstone, stone, obsidian, and coal blocks.
It's odd, but it works as intended.

Agree with Neospector

eh Neospector? I even mention in the report that obsidian shows up black, and that thing is purple. It certainly doesn't show up grey. Not sure how you would consider this a works as intended, as far as I'm aware, maps are intended to represent the blocks in a color indicative of the block. Obviously there are some examples where that is not the case, however I think this is certainly a case where it is more incorrect than it is not incorrect.

I honestly don't know, all I know is that sandstone shows up grey and that that's intended.
So it's very likely, though may require confirmation.