Summoning Falling Sand will not show it visually when it falls

What I expected to happen was...:
When I would summon a Falling Sand entity with a command block /summon FallingSand ~ ~3 ~, it would show the sand for a very short moment.
What actually happened was...:
Nothing never showed up. Command block said Object successfully summoned.
Even when I made a very fast clock running into the command block, nothing showed up.

Steps to Reproduce:
1. Get yourself a command block
Command: /give @p command_block
2. Put it on the ground and type this command in it:
/summon FallingSand ~ ~2 ~
3. Put a redstone block next to the command block and you will notice that nothing happens above the command block.

Extra information:
If you add

into the command, you will notice that it will summon
a sand, but you won't see it fall. It just appears above the command block.
Command: /summon FallingSand ~ ~3 ~

If you make the sand spawn higher, the time it takes to fall increases and
therefore it will take a longer time for the sand to appear above the command
block.
Command: /summon FallingSand ~ ~10 ~