Collidable

Expected behavior

Using LivingEntity#setCollidable(boolean) should disable or enable collisions with the living entity.

Observed/Actual behavior

When setting collidable to false on Player, it collides with another entity no matter if it is set to false or true.

Steps/models to reproduce

1. Spawn entity or obtain entity instance
2. Get player instance
3. Use setCollidable(false) on the player
4. Collide with the entity :)

Plugin and Datapack List

[16:52:55 INFO]: Server Plugins (4):
[16:52:55 INFO]: Bukkit Plugins:
[16:52:55 INFO]: - FastAsyncWorldEdit, Multiverse-Core, ServerFramework, VoidGen

Paper version

[16:53:13 INFO]: Checking version, please wait...
[16:53:14 INFO]: This server is running Paper version 1.21.1-99-master@1bc02e6 (2024-09-25T02:41:02Z) (Implementing API version 1.21.1-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.1-98-9b1ee0d (MC: 1.21.1)

Other

I was doing this when command is issued using Brigadier, though I don't think that could cause any issues.

Start by reproducing the behavior described for LivingEntity#setCollidable(boolean) on Paper 1.21.1-99, using a player and another entity as in the listed steps. Check whether both false and true produce the same collision result, and consider the Brigadier-issued command context noted in the report. Done means false disables the relevant collision and true restores it.