[MC-277549] Arrows summoned with custom motion don't render correctly

When an arrow is summoned with motion copied from another arrow, the new arrow doesn't visually update for about 1-2 seconds (or until it hits something). Server-side functionality works as expected (dealing damage, etc)

Steps to reproduce:
1) Shoot an arrow
2) Summon a new arrow and copy the Motion data from the first arrow to the second arrow
3) Kill the original arrow
~~4) Observe the new arrow fall to the ground for 1-2 seconds before being updated to its correct position~~
4) Observe the new arrow face the wrong direction temporarily until its rotation is corrected during flight (if the arrow hits a block quickly after being fired the rotation will not have time to update)

Download the attached datapack and shoot a crossbow to see this in effect.

~~Video demo:~~ ~~https://youtu.be/e1s2BCh8F2Y~~
Updated video demo: https://youtu.be/32UtDGqt8a8

Linked issues

relates to

MC-139548 Projectiles are rendered incorrectly if their Motion tag was recently changed

Attachments

arrow-desync-demo.zip

Comments

Bansed 2024-10-12T10:26:19Z

Does MC-139548 describe your issue?

Strongis13 2024-10-12T15:27:59Z

The bug with arrows only started occurring in 1.21.2 snapshots, it was not an issue in 1.21.1. But the bug you linked does appear to be similar yes.

It is also worth noting for those who are familiar with mapmaking techniques, air toggling fixes the arrow visual bug as seen in my video above.

Strongis13 2024-10-18T01:09:46Z

Confirmed in 1.21.2-rc1

Strongis13 2024-10-31T00:20:09Z

This was marked as fixed in 24w44a, but the issue is not completely resolved. Now when the arrow is summoned, it will be in the correct position but it will be facing south. The rotation is slowly corrected as the arrow flies through the air, but it can get stuck in a wall facing the wrong way if it lands quickly after being shot. I have linked a new video in the post showing this updated behavior.

Arisa Bot 2024-10-31T00:20:43Z

⚠️ Please do not add Affected Versions to resolved reports.

Have a look at the Resolution and the comments to see why this ticket has been resolved. If you think this ticket has been resolved erroneously you can contact the Mojira staff on Discord or Reddit.

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Shugoh 2024-10-31T08:59:52Z

Hey @unknown, the new rotation behaviour is as intended. If you want the arrow to spawn with the correct initial rotation, you need to set that rotation. The movement direction will slowly rotate the arrow, but the initial rotation will not be overwritten by the motion anymore. Hopefully this can be worked around and might even make more things possible as these are now decoupled.