As of what version? This duplicates #171

0.0.6.3 I believe, I'll double check the version and issue in a minute.

Light from the sky just passes through them and zombies burn under them

Note no shadows on the floor and burning zombies compared to the minecraft stone on the right

this is still an issue in 1.10.2-0.0.7.3, made a darkroom out of chiseled blocks and no mobs would spawn

@tterrag1098 still an issue over half a year later Chisel-MC1.10.2-0.0.13.29