I have been trying to disable collision between certain entities using both LivingEntity#setCollidable and nms.Entity#noclip. What I expect is the behavior described in SPIGOT-3942. However, all entities are still able to push each other around.

[Server thread/INFO]: This server is running CraftBukkit version 3028-Spigot-79d53c2-7eb3564 (MC: 1.16.5) (Im
plementing API version 1.16.5-R0.1-SNAPSHOT)