Now naturally spawning mobs spawn at the center of a Block. However, I think this will lead to a significant difference in difficulty between the current Bedrock edition of the game and the Java edition.

When the simulation distance is greater than 4, the population control limit determines that it is impossible for a player to meet more than 16 monsters at close range in a cave. However, in the Java edition, the maximum number of monsters that can be generated in single player mode is 70.

While the 16 monsters in the cave plus the 8 monsters on the surface average to close to the Java edition per chunks in terms of average density, it is clear that under the existing mechanics, Java players can encounter more monsters in the cave, and these monsters can also cluster together, while the bedrock monsters are very dispersed due to the density detection mechanism. The players may hardly meet those mobs.

This actually greatly reduces the difficulty of the game when the simulation distance is greater than 4. When the simulation distance is 4, monsters frequently spawn and despawn, and the difficulty of the game is close to the Java version.