use the nbt"Motion"in/summon minecraft:falling_block ~~~find the block can'tmove north or south

In Minecraft 1.16.5, use /summon minecraft:falling_block ~~~ {BlockState:

{Name: block name}

,Time:1,Motion:[0.1d,0.6d,-0.1d]} The block will behave the same way when using /summon minecraft:falling_block ~~~ {BlockState:

{Name: block name}

,Time:1,Motion:[0.1d,0.6d,0.1d]}

In Minecraft 1.20.6, the above two commands will be combined with /summon minecraft:falling_block ~~~ {BlockState:

{Name: block name}

,Time:1,Motion:[0.0d,0.6d,0.0d]} has the same effect