[MC-110892] Evoker fangs can only spawn on full blocks, not slabs

Evoker fangs can only spawn on full blocks, not slabs

Isolate evokers in a little box, with walls
Make an area where the villagers will be, that uses both slabs, and full blocks in the floor.
Spawn the villagers
Evokers should attack the villagers with fangs, but only if they stand on a full block.

Linked issues

Can confirm for MC 1.12.1.

Confirmed for 1.13.1, although if there's a solid block under the slabs, they will spawn.

Confirmed for 1.13.2-pre2.

affects 20w18a

affects 20w19a

affects 20w20a

This might be intended as mobs will only spawn on full blocks.

Can't seem to reproduce this in 21w06a. The evoker fangs summoned from an evoker spawn on both full blocks and slabs.

Avoma I am still able to reproduce this in 21w07a

⚠️ Please do not mark Unreleased Versions as affected. You don't have access to them yet.

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