setblock command_block whith command_block

Hello, I don't know if it's a bug or a mistake because of the change of minecraft

but it is impossible to perform a setblock of a command_block, which itself performs a summon of a command_block_minecart , same thing with tellraw

 

example :

setblock ~ ~2 ~ minecraft:command_block{Command: "summon minecraft:command_block_minecart ~ ~2 ~ {DropItem:0,Invulnerable:1,Command:"summon falling_block ~ ~47  {BlockState

{Name:"minecraft:black_stained_glass"}

,Time:1,DropItem:false,HurtEntities:1,FallHurtMax:40,FallHurtAmount:40}"}"}

 

setblock ~ ~2 ~ minecraft:command_block{Command:"tellraw @a

{"text":"Hello"}

"}

 

thanks