Trial Keys stacked to 64 in Beta. Players were carrying full inventories. Chest monsters were real.
Worst bug: The Bogged’s poison arrows could chain infect villagers. One swamp villager turned an entire forest green. minecraft 1.21 beta
Mojang removed "Trial Chamber Echoes" (ambient cave sounds) because Beta testers reported hearing phantom voices. Creepy stuff. Trial Keys stacked to 64 in Beta