Issue Description:

After i painted stairs or Steps with Marble from project Red or Basalt from ProjectRed there come light still through. There also spawn mobs sometimes in thoose stairs, cause i cant light up the face below the stair. but if i use F7 i can see red lined below the stairs.

What happens:

Light come through painted Stairs or steps

What you expected to happen:

that light dont come through painted blocks and mobs dont spawn half inside steps.

Steps to reproduce:

1. Paint a unpainted Step (for example stone slap step) with ProjectRed Marble
2. Place step inworld
3. wait until mob spawns or use F7 amd look a bit arround to see the red mark below the stair.
   ...

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Affected Versions (Do not use "latest"):

• EnderIO: EnderIO-1.12.2-5.0.50.jar
• EnderCore: EnderCore-1.12.2-0.5.65
• Minecraft: 1.12.2
• Forge: forge-1.12.2-14.23.5.2838-universal
• SpongeForge? no
• Optifine? yes
• Single Player and/or Server? Server

Your most recent log file where the issue was present:

nothing in log to see cause it dont cause any errors or outputs.

Got it to make some screenshots now. Thats the inside of my house where is used a stone slap as decoration for outside.

Thats the Outside. Below painted stairs or slaps is always dark, and it cant be lighten up in any way. The Mobs spawn also inside thoose blocks.

I hope that helps a bit more as reference :)