Java Edition
Spawning uses Java mob caps and despawn spheres.
Edition comparison
Java vs Bedrock: Mob Spawning
Simulation distance, caps and spawning checks differ.
Java vs Bedrock: Mob SpawningBedrock Edition
Bedrock uses density caps and different simulation-distance rules.
Practical impact
Choose a design, command or workflow explicitly tested for your edition; mob spawning behaviour is not always portable.