Overlapping entity shadows render improperly or fail to render

Bug Description

Overlapping entity shadows appear to "cut" through each other, and render differently depending on the angle they're observed. 

Steps to reproduce

• Spawn a couple of entities and place them next to each other

Alternative

• Ride an entity and look at the shadow in third person

What was expected

 Like in the Java Edition, the shadow oppacity would be increased due to the overlapping of multiple shadows

What was observed

 The shadows either completely fail to render or render improperly