youngju park

it's easy to reproduce this proplem. No special presets required
[step 1]
enter command "scoreboard objectives add flying_timer dummy"

[step 2]
use repeat command block & chain command block with unconditional and insert following command

scoreboard players add @e[type=arrow] flying_timer 1

execute as @e[type=arrow,scores={flying_timer=1}] store result entity @s Motion[0] double 0.0002 run data get entity @s Motion[0] 10000

execute as @e[type=arrow,scores={flying_timer=1}] store result entity @s Motion[1] double 0.0002 run data get entity @s Motion[1] 10000

execute as @e[type=arrow,scores={flying_timer=1}] store result entity @s Motion[2] double 0.0002 run data get entity @s Motion[2] 10000

[step3]
it's all!
If you shoot a crossbow or bow(with full power), you will notice that there are problems with arrow animation.

**"Motion[n] double 0.0002 run data get entity @s Motion[n] 10000" means a command that multiplies the arrow motion value by 2.

**it works correctly in 1.21.1 and previous version

I think it's a similar but different issue to MC-139548.

MC-139548 was an issue in 1.21.1 and earlier versions

but this issue was not an issue in 1.21.1. and earlier version.

and i don't use "data merge" commands, i use a "execute store result entity"