[MCPE-60421] Slabs, Glass, and Leave Blocks with sky access prevents mob spawn under them.

Whenever there is a slab, a glass, or a leave block with sky access, no mobs can spawn below them. It has broken many mob farms.

Related issues

[Mojang] Mega_Spud (Jay) 2019-12-27T09:15:17Z

Thank you for your report!
We're actually already tracking this issue at MCPE-59682, so we will resolve and link this ticket as a duplicate.

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