When you type like /summon FallingSand ~ ~20 ~ {Time:2}
You don't see the sand falling, it just appears on the ground after a couple of seconds.
Linked issues
Comments
O I'm sorry
Duplicate of MC-48476 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Duplicate of MC-48476