The bug

Villagers will give the player gifts when under the Hero of the Village effect. Most of these gifts have loot tables, but the ones for baby villagers (poppies) and nitwits/unemployed villagers (wheat seeds) do not.

How to reproduce

1. Type

   /loot give @s loot minecraft:gameplay/hero_of_the_village/

2. Look through suggested loot tables
   →  Notice that there is no suggestion for baby villagers or nitwits/unemployed villagers