Weird lines in my world and animal mobs despawn

This is a realm on bedrock 1.16.210. Also my villagers and random animal mobs have despawned. I have been having issues with villagers I have master trades with have despawned. 2 donkeys tied to post with chest attached full of cobble stone have despawned in the same village. Now to day I loaded my world and a horse I had named tied to a post had despawned. I went and got another horse to tie up and when I got off the horse it disappeared.