Minecraft wiki entry for The_Wild_Update, associated text: Voted to be in the update during Minecraft Live 2021.
If given a block or item, finds dropped blocks or items of the same type and bring them to the player.
Picks up dropped items in loaded chunks and can carry up to a stack at a time,[10] and cannot duplicate items[11] or take items out of chests.[12] It drops its collected items when in range of a note block that was played within 30 seconds.
Spawn within prisons in Woodland Mansions and cages in Pillager Outposts.[13]