Zombies pick up dead player items and delete them upon death. This included golden apples, enchanted golden apples, swords, pickaxes, armor, and bad omen vials. For each player that died, if they had any armor, weapons/tools, bad omen vials, or any type of golden apples, they disappeared when the trial chamber mobs were killed. Food, blocks, emeralds, and mob drops were not picked up that we noticed.