Projectiles stop tracking when players move into them

[jtJava]

Expected behavior

The projectile should keep tracking, instead of phasing to where it lands.

Observed/Actual behavior

https://youtu.be/pxklrZbF_R4

Steps/models to reproduce

Shoot arrows while moving forward on a 1.21.8 paper server with no plugins, the arrows will desync. This bug does not happen on 1.21.8 vanilla

Plugin and Datapack List

None

Paper version

This server is running Paper version 1.21.8-11-main@a5f2f61 (2025-07-22T08:53:33Z) (Implementing API version 1.21.8-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.4-DEV-25e1915 (MC: 1.21.4)

Other

Maybe related to #12200

[kennytv]

Hm I can't seem to reproduce this

[jtJava]

Hm I can't seem to reproduce this

Try with some artificial ping, I noticed it more when I had lag.

[jtJava]

I previously tested in Singleplayer, after testing without using integrated server I could reproduce it in vanilla.