Some large areas do not spawn cows, pigs, sheep, chickens. This is probably related to MC-237104 and MC-237074.

Steps to Reproduce:
1. Seed 202109291427 version 21w39a, survival. Player spawns near x=-80, z=206.

2. Walk south west and you will see sheep on the hillside. Continue through the village to about x=-400,z=600.

3. You will be standing in plains/sunflower_planes devoid of any cows, pigs, sheep, or chickens.  Save game.

4. Entity file r.-1.1.mca confirms no cows, pigs, sheep, or chickens in 512x512 area, most of which is plains or sunflower_plains.