Any shadows cast by entities (mobs, players, items) will not show up on many of the transparent blocks, even if the blocks have full top hitboxes.
List of effected blocks:
all Slabs, all Stairs, Glass, Trapdoor, both Pistons extended or not.
list of strangly exempt blocks:
all Leaves, Spawner, Ice
- duplicates
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MC-21024 Entity shadows not showing on transparent blocks (slabs, stairs, cauldron, hopper), but showing on block below
- Open