Sky access in ravine that's covered

In a ravine that's completely covered, the game believes it has sky access. This is not just a lighting bug. It shows in the F3 menu and Zombies and Skeletons are both burning up.

Seed: -8287259934358017991

Coordinates: -117 / 14 / -1095

UPDATE: There's another spot at -100 / 11 / -1077 in a mineshaft.