Armor Stand with Motion nbt stop moving after it becomes to have NoGravity:1b

while I was making a map, the only armor stand with a non zero Motion suddenly stops Moving after I use command "/data merge entity @e[type=minecraft:armor_stand,limit=1]

{NoGravity:1b}

"

1. create a new map
2. summon a armor stand
3. use command "/execute store result entity @e[limit=1,type=minecraft:armor_stand] Motion[1] double -10 run data get entity @p Motion[1]"
4. quickly use command "/data merge entity @e[type=minecraft:armor_stand,limit=1]

{NoGravity:1b}

"