The bug
Arrows without any motion ignore the rotation parameter of the /tp command and always try to match rotation [0, 0].
Arrows with motion always point in the direction they are moving towards, but that is likely working as intended.
How to reproduce
/summon minecraft:arrow ~ ~ ~ {NoGravity: 1}
/execute as @e[type=minecraft:arrow] at @s run tp @s ~ ~ ~ ~45 ~→ ❌ The arrow is not going to rotate by 45 degree. It instead just face the original direction.
Attachments
Comments 8
I believe that the direction is not changed server side, or at least not count into the direction of directional tp at all.
If you intead use ^ directional tp to move the arrow.
In the next directional tp, the arrow is still go straight just like it displayed
I checked it with command:
/data get entity @e[limit=1,type=minecraft:arrow] Rotation[0]
It seems that rotation is done, but arrow rotates back itself almost instant to the direction it flies. As it doesn't fly to any direction, direction is by default [0,0], as so rotation.
20w06a "affected" Description needs to be updated:
Rotation of projectile with velocity=[0,0,0] changes to [0,0] right after forcing it to another direction with command. It should stay without any change.
I think it is rotated, but only on serverside. Check:
MC-99442
MC-103426
MC-124197