Hello, I have come across this issue when trying to put a block on the ground whilst it staying as an entity, and it didnt work.

 

Commands used:

/summon minecraft:falling_block ~ ~ ~ {BlockState:

{Name:"minecraft:stone",NoGravity:1b,Invulnerable:1b}

,Time:574981657349}

/summon minecraft:falling_block ~ ~ ~ {BlockState:

{Name:"minecraft:stone",NoGravity:1,Invulnerable:1b}

,Time:574981657349}