Villagers, golems, traders, animals disappearing

I had a village with villagers, a golem, a wandering trader, animals in fences, and horses leashed up. The village was also fenced up. All of it disappeared when i went into the game. Yesterday it was all there, but today when i entered the game, all of it disappeared. Even the randomly spawned mobs (cats, sheep, llama) had all despwaned and new ones spawned when i had played for a minute