Whenever a projectile such as a wind charge or a snowball have recently been summoned, trying to change the motion data of these entities creates weird glitchy desync

To Replicate:
/execute summon minecraft:wind_charge run data merge entity @s {Motion:[0.0,-1.0,0.0]}

If you wait, the motion merging works fine

To Replicate:
/summon minecraft:wind_charge
wait 10 seconds
data merge entity @n[type=wind_charge] {Motion:[0.0,-1.0]}

I encountered this bug when trying to make a wind charge auto-fire in the direction a player was facing