When you beat the raid and are standing around, not AFK just standing, waiting for the villagers to throw things at you, they sometime will pick back up the things they throw.
Instance A: One villager will throw something like bread at you, the villager will then take it back and you can't ever get it.
Instance B: One villager will throw something then another villager will come and take it.
I tried to walk and get it before the other villagers could get to it, that didn't work. Not game-breaking or would stop from going farther in the game, just annoying.
Because of the lack of upkeep on this report, I would suggest forward resolving it as a duplicate of MC-236230, which is fairly detailed.