friendly Mobs and items despawning since the weird noise update

I have a monthly payment realm. I had every color sheep, A bunch of animals and they have all despawned. My horses with diamond armour and name tags have also despawned. I gathered more animals and within 13 minutes they despawn. I work in survival mode so getting name tags and diamonds is quite a job . Now my anvil is gone. I'm very sad. I miss my farm. I want my stuff back.