Projectiles sometimes ignore player entities

Expected behavior

Projectile is expected to hit the entity, however, occasionally goes ignores the entity.

Observed/Actual behavior

The projectile completely ignores entities.

Steps/models to reproduce

I can consistently reproduce with an arrow or fishing rod in survival mode. It was impossible for me to reproduce this while in creative mode.

Latest version of Paper with a plugin to spawn the bot (no event listeners).

https://youtu.be/_Uk5kCJ3Z0o
https://youtu.be/B-FhIEWiy1Q
https://youtu.be/OPEVF-fKsdc

Plugin and Datapack List

Only 1 private plugin. Only event listener is a chat listener.

Paper version

This server is running Paper version 1.21.4-185-main@0a6e743 (2025-02-26T13:10:43Z) (Implementing API version 1.21.4-R0.1-SNAPSHOT)\nYou are running the latest version\nPrevious version: 1.21.4-177-e5a8ee8 (MC: 1.21.4)

Other

I attempted to fix this by using a task to manually check if bounding box between projectile and entities overlap, and this also failed.

No source file or test is named. Start by reproducing the issue in Paper 1.21.4-185 using an arrow or fishing rod in survival mode with the reported bot-spawning plugin, then compare behavior in creative mode. Done means projectiles consistently hit player entities without the private plugin or manual bounding-box checks changing the result.