Chunk error and Pillagers not spawning

When I located the Pillager Outpost I noticed that Pillagers weren't spawning and most of the terrain looked cut out or flat.

Seed: -3133655163643162176

Coordinates: X: 859 Y: 69  Z: 1154

 For the one in the cave the coordinates are:

X: 940 Y: 60 Z: 1059