Bedrock Edition level format/Block entity format

=BlockActor=


 * The namespaced ID of this block entity.
 * : The X position of the block entity.
 * : The Y position of the block entity.
 * : The Z position of the block entity.
 * : True if this block entity is movable with piston.
 * : (Optional) The custom name of this block entity.

=Additional fields for block entity types=

banner

 * : The base color of the banner.
 * : The type of the block entity.
 * : The list of patterns on the banner.
 * : A pattern.
 * : The id of the pattern.
 * : The base color of the pattern.

Beehive

 * : (Optional)
 * : (Optional)

Brewing stand

 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase

Campfire

 * : is 1, 2, 3, and 4
 * : (Optional) is 1, 2, 3, and 4
 * ItemStackBase

Cauldron

 * : (Optional)
 * ItemStackBase
 * : (Optional)
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase

Chemistry tables

 * : (Optional)
 * : (Optional)
 * : (Optional)

Chest
this.saveItems chest:
 * : (Optional)
 * : (Optional)
 * : (Optional)
 * : (Optional)
 * RandomizableBlockActorContainerBase
 * RandomizableBlockActorContainerBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase

Command block

 * : (Optional)??
 * BaseCommandBlock
 * : (Optional)??
 * BaseCommandBlock
 * BaseCommandBlock
 * BaseCommandBlock
 * BaseCommandBlock
 * BaseCommandBlock

Dispenser

 * RandomizableBlockActorContainerBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase

Enchanting table

 * : (Optional)

Flower pot

 * : (Optional)

Furnace

 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase

Hopper

 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase

Item frame

 * ItemStackBase
 * ItemStackBase
 * ItemStackBase
 * ItemStackBase

Jukebox

 * : (Optional)
 * ItemStackBase

Lectern

 * : (Optional)
 * : (Optional)
 * : (Optional)
 * : (Optional)
 * ItemStackBase

Lodestone

 * : (Optional)

MobSpawner
BaseMobSpawner

Moving block

 * : (Optional)
 * : (Optional)
 * : (Optional)
 * : (Optional)
 * : (Optional)
 * : (Optional)
 * : (Optional)
 * : (Optional)

Shulker box

 * Chest

Structure block


=Additional fields for block entity categories=

RandomizableBlockActorContainerBase

 * : (Optional)
 * : (Optional)