/setblock Falling Sand doesn't show block until block is settled

What I expected to happen was...:
upon button click 1 Sand would Fall from sky using a command saying: summon FallingSand ~ ~10 ~

What actually happened was...:*
After a few seconds the sand appeared on top of the command block which was the first view had of the block.

Steps to Reproduce:
Put a step by step guide on how to trigger the bug here
1.In a command block type: summon FallingSand ~ ~10 ~

2.Place a button on the command block by holding shift and placing

3.Click the button and Observe