When you cover something with slabs light passes through. Like when you make your house's roof or something similar. Or when you are doing the roof of a zombie farm, and that makes that zombies can't spawn.
Linked issues
is duplicated by 12
MCPE-186962
Zombie Villagers dying while being cured
Resolved
MCPE-188130
Stairs do not stop undead mobs from burning
Resolved
MCPE-178152
Zombies and Zombie Villagers burning under stairs
Resolved
MCPE-174778
Zombies get on fire inside
Resolved
MCPE-174776
Light Passes Through Stairs and Slabs
Resolved
7 more links
Attachments
Comments 4
This creates some funky visual glitches when building with slabs. I would love to see this get fixed.
By “funky visual glitches”, are you referring to MCPE-54410 and MCPE-48366? Those are not caused by this issue.
Is it a bug tho? You have to place full block for light to not pass. Slabs, stairs can't block lights.