When you update the Motion of a flying Arrow with /data, it does only update serverside.
To reproduce, you can use the following commands:
/summon arrow ~ ~2 ~ {NoGravity:1b}
/data merge entity @e[type=arrow,limit=1,sort=nearest] {Motion:[0d,0d,-0.5d]}
You should see, that the arrow ow "jumps" every so often to its new sever-side position but still facing the direction it was facing when it was summoned.
Linked issues
is duplicated by 2
Comments 4
This still happens in the latest version, 1.21.2 Pre-Release 5:
How I encountered it: changing an arrow's motion with the tick function as soon as I shot it. It will only update when the arrow lands. Not fixed.
Suspected solution: just update the client on the arrow's motion when it is changed by a command.
NeunEinser
Since in the recent 1.10 Snapshot there is NoGravity for all Entities, you can see the effect for an Arrow with NoGravity very clearly.
Just do: