Minecraft wiki entry for Development_versions, associated text: Version exclusive: /tickingarea
Replaces the functionality of spawn chunks in the Java Edition" and allows the creation of areas that update even if no player is around
Many ticking areas can be created as long as the chunk limit is not exceeded
Ticking areas work inter-dimensional
Enables features such as crop growth, command blocks, redstone and mob activity when the player is not around
Command variations:
tickingarea add <from: x y z> <to: x y z> [name: string] (adds a ticking area for a set string in a defined area)
tickingarea add circle <center: x y z> <radius: int> [name: string] (adds a ticking area for a set string in a defined circular area)
tickingarea remove <position: x y z> (removes a ticking area from a position)
tickingarea remove <name: string> (removes a ticking area from a set string)
tickingarea remove_all (removes all ticking areas)
tickingarea list [all-dimensions] (lists all ticking areas)
Version exclusive: tick_world
Prevents entities from despawning and makes an entity load the world
Optional despawn distance available for entities that should despawn when players are far away (eg Ender Dragon)
Version exclusive: user interface elements for commands to prevent the need for typing[3]
@s selector[4]
Used to target the entity executing the command
/summon:
Ability to summon projectiles like fireballs, dragon eggs, etc.