I initially updated to 2.9.4.10 to try to fix this. I let the config regenerate, checked in the creative inventory search and in NEI, but the roughbricks.png texture just doesn't seem to be used.

So wait... There's a missing texture for one of the stonebricks variants in-game? This should not be possible.

No I think it's that the texture doesn't have a block

TehNut is correct, sorry for not being clear.

Old textures were abandoned