Mob spawns are broken

Summary:

I recently played the old versions of Pocket Edition and Bedrock Edition and found that the mob generation is bad now

Steps to Reproduce:

1. Enter the world and wait for mobs to spawn

Observed Results:

Mobs are often spawned in front of the player, and multiple mobs are spawned in one place, they are no longer scattered. The mobs in the picture are still stuck in the leaves

Expected Results:

Mobs don't spawn in front of you out of thin air and huddle together, but instead spawn in an empty place waiting for you to see them