Falling Sand Entities containing water or lava do not render until landing
While using the command below, it appears that FallingSand entities containing water or lava are not being displayed until they land on another block. I have noticed however, that shadows appear where they are spawned, and near the end destination.
/summon FallingSand ~2 ~1 ~ {Block:water,Time:1,DropItem:0,Motion:[0.0,0.5,0.5]}
It appears that this glitch has happened before in minecraft, was fixed, but has reappeared.
The gfycat link below is a video demonstrating the bug. As you can see there is a shadow on the command block (where the Entity is being spawned) and a shadow where the Entity is landing, but you cannot see the entity as it flys through the air. I also show that the shadows are being generated along the path of the water, but the water is not displayed until it lands.