The bug

Allays are meant to be able to pick up items. However, despite the player being able to pick up tridents they've thrown, allays make absolutely no attempt to track down such tridents, nor can they pick them up in the first place. This is unexpected since allays should be able to pick them up.

How to reproduce

1. Obtain two tridents
2. Give one trident to an allay
3. Throw the other trident near the allay as to be within its detection range (make sure the trident can be picked up, i.e. you must be in Survival mode)
4. Wait on the allay collecting that trident

Expected results

As thrown tridents are a thing that can be picked up, the allay would pathfind to said trident and pick it up just like a player would.

Actual results

Allays make absolutely no attempt to pick up thrown tridents.