Sorry me again, being a pain!

Glowstone slabs aren't emitting the correct light level
See 3 screen shots below

Vanilla Glowstone light behaviour

Bottom slab light behaviour, seems to match that of vanilla glowstone.

Top slab only, no light emission at same level

Top slab will however emit light downwards

Bottom slab, does not

Closing this since we fixed it for the glowstone sets, and 0.4.1 is releasing in a few days. May still happen with crying obsidian slabs/stairs if we don't do anything about it before then, but its a small enough thing where it shouldn't impact anything if left unfixed for a bit longer

Interesting. We'll definitely look into this, thanks for reporting! Do the stairs, walls, and gates function correctly, or is it just the slabs that do this?

Stairs placed the normal way up are fine

Upside down they are not

When upside down, if you break the block in front or to side it will emit light

But not when you break the block behind

Walls are fine however/wherever you place them

AAAAAAAÀAAAAAA

Alright so, it seems to me that light calculations might not like the fact that these are irregular blocks for light. I'll see what I can do soon.