Nautilus Spawning Mechanics Inconsistent Between Bedrock and Java Editions

The nautilus spawning behavior in Bedrock Edition differs significantly from Java Edition in multiple aspects: spawn group size lacks Java's 2-3 grouping, missing Y-level restrictions (Y38-Y58 in Java), incorrect usage of "monster" population controls instead of aquatic mob categories, and inconsistent spawn position alignment (Northwest corner vs. center). These discrepancies affect aquatic ecosystem balance and cross-edition parity.

behavior_packs\vanilla_1.21.130\spawn_rules\nautilus.json

"minecraft:spawn_rules": {
    "description": {
      "identifier": "minecraft:nautilus",
      "population_control": "monster"
    },
}

        "minecraft:herd": {
          "min_size": 1,
          "max_size": 1
        },

How to Reproduce:

1. Locate warm/deep ocean biomes in Bedrock Edition

2. Observe nautilus spawn patterns, group sizes and Y-level distribution

3. Compare with Java Edition's spawning behavior

Observed Result:

- Single nautilus spawns per group (vs 2-3 in Java)

- No Y-level restrictions observed

- Spawns at Northwest block corner

- Reduced drowned spawns due to monster cap sharing

Expected Result:

- Nautilus should spawn in groups of 2-3

- Implement Y-level restriction (Y38-Y58)

- Use aquatic mob population controls

- Spawn at block center like Java Edition