Light-emitting solid blocks (lit furnaces, magma blocks, glowstone, lit redstone ore) let light (sunlight, block light) through

The bug

Light-emitting full solid blocks let light through.

Affected blocks:

• lit furnace
• magma block
• lit redstone ore
• glowstone
• lit redstone lamp
• jack o'lantern

Code analysis and suggested fix

Code analysis and suggested fix by Ben Staddon can be found in this comment.

Forge pull request

A pull request on MinecraftForge can be found here: https://github.com/MinecraftForge/MinecraftForge/pull/4642