Minecraft Realms World Corruption

Minecraft Realm world is corrupted. My friends realm world is broken or corrupted, not sure what caused it and don't know how to handle.
A cycle of cunks gets loaded where the world is broken and it changes every second. It makes massive lag and is a big isue. It seems to be a rendering glitch, because I can go into the broken chunks and walk on what seems to be the world as it is supost to be. So I can stand on the glitched ground and feel the walls but can only see chunk errors.
For a more detaild view of the bug, I added images of it.