I hope you realize that we can't actually watch it, you didn't even upload the video.
It's probably because of the shield. Shields are extremely buggy on console versions of bedrock. They cause my framerate to drop significantly and make the chunks load extremely slow.
This happens way too often on my Survival world. I have no idea if it's an issue with the file size (220MB).
This is a huge issue on Nintendo Switch too. I load my world with my character already equipping a shield and there's a huge framerate drop. Not only that but the entities load before the chunks as well. Sometimes, my game will even crash.
This happens on Switch and gets very annoying.
This happens in my world all the time. Usually, they spawn somewhere underground, so I won't be able to even kill them.
This is normal.
It's probably not an issue with the game, but your device. What model do you have?
Affects Nintendo Switch version too.