Light can pass through composter sides

Can confirm in 21w37a.

Can confirm in 21w42a. Here are some extra details regarding this problem.

The Bug:

Light can pass through the side faces of composters.

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.

Can confirm in 21w44a.

Can confirm in 1.18.