tridents repel entities

I've attached a video showing both manifestations of this bug: a trident cage preventing a zombie from moving, and zombies bouncing off of tridents that they land on.

It appears that tridents can cause entities to clip through blocks. I am not sure how to generalize this glitch, but it is probably caused by trident knockback.

I can confirm that trident hitboxes are at least half a block wide, which is larger than I would expect. The test involved floating-point precision errors, so I cannot give an exact size. However, the size rounds to at least a full block past 4,194,304, meaning that it is at least half a block in the playable region.

Entities can have a collision box that affects their interactions with blocks and entities in the game without repelling or "colliding" with mobs, simply by setting

"minecraft:pushable": {
				"is_pushable": false

This is how vanilla armor stands work. I have attached a behavior pack that fixes this bug by applying this setting to thrown tridents:

.

Note that this setting does not impact the ability of tridents to hit mobs. Projectile hits do not use either the is_pushable setting or the collision box (the latter is reported as a bug at MCPE-118695).

The trident collision box is as follows, from thrown_trident.json:

"minecraft:collision_box": {
				"width": 0.25,
				"height": 0.35
			},

Affects 1.17.40.20