Light can pass through composter sides

The Bug

Light enters through the composter.

Steps to Reproduce

• Summon a box of dirt around yourself, so that your surroundings are completely dark.

  /fill ~-2 ~-1 ~-2 ~2 ~3 ~2 minecraft:dirt hollow
  

• Summon a composter on one of the sides of the dirt box and pay close attention as to whether or not the light levels in the box changes.

  /setblock ~2 ~1 ~ minecraft:composter
  

• Take note as to whether or not light can pass through the side faces of composters.

Observed Behavior

Light can pass through the side faces of composters.

Expected Behavior

Light would not be able to pass through the side faces of composters.