Minecraft wiki entry for Development_versions, associated text: Added two new advancements:
You Got a Friend in Me
Have an Allay deliver items to you
Birthday Song
Have an Allay drop a cake at a note block
Added item_delivered_to_player advancement trigger.
Triggered when an allay delivers an item to a player, with following conditions:
player: a player for which this trigger runs
Added allay_drop_item_on_block advancement trigger.
Triggered when an allay drops an item on a block, with following conditions:
player: a player for which this trigger runs
location: a predicate for the block that the item was dropped on
item: a predicate for the item that was dropped