Entities under water and lava have no shadows

Summary:
Entities under water and lava, completely submerged, have no shadow. I don't see any reason why the shadow shouldn't be under water, since when an entity is standing in the water, but not completely, there is a shadow (for example, a zombie standing in 1 block of water). Also breaks parity with Java.

Steps to reproduce:

1. Summon any entity underwater/under the lava.
2. Look at the blocks, underneath the entity.

Observed results:
There is no shadow.

Expected results:
The shadow will appear as if the entity were not completely underwater.

Screenshots: