When spawning a falling block with the same block as the block at the location of the falling block, the block gets removed from the client side but it's still there when you try to walk thru the spot.

When you place any block on that spot it reappears or when you reload the world.

Command used:
/summon minecraft:falling_block 181 5 -167 {Time: 560, Glowing: true, NoGravity: true, BlockState: {Name:"target"}}

(only the blockstate needs to be the same as the block your summoning it in, the other variables don't matter)