I have started to build a mob far in Minecraft Pocket Edition. It is a basic farm built at exactly the height limit. You can see the outside in the picture below.
The problem is inside the spawn platform, the light level stays the same as outside. For example, it looks as if sunlight is shining inside, but it is not.
The roof is made entirely out of full spruce wood plank block, and not slabs or stairs. Is this a glitch, or is it supposed to be like that? The ceiling is at exactly the height limit, which is 128 blocks in the current version. I am in Minecraft Pocket Edition version 0.13.1, the latest as of the start of 2016.
Is it because of the small distance from the height limit, or the tube? There is a Jack-o-lantern at the bottom of it, but a 55 block way down. The farm is directly above the world spawn, so there is a lowered part in the ceiling. I'm not sure if light can pass through the blocks at a diagonal edge, aslthough there are some cases where this can happen.