[REALMS-2646] mobs spawning on stairs and slabs

Mobs are spawning on roofs made off stair blocks, lower half slabs and pressure plates.

Related issues

[Mojang] Mega_Spud (Jay) 2019-12-19T12:10:03Z

Thank you for your report!
We're actually already tracking this issue at MCPE-54241, so we will resolve and link this ticket as a duplicate.

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