Minecraft's Anvil chunks (r.#.#.mca) typically have a block_entities tag which defines all the blocks in the chunk. Parsers like anvil-parser rely on this.
From minecraft.fandom.com :
block_entities: Each TAG_Compound in this list defines a block entity in the chunk. See Block Entity Format below. If this list is empty, it becomes a list of End tags.
I have downloaded the World file from this page which to my surprise, contained some .mca files with no block_entities tag. It's in 18.2 format.
What does it mean ? Is the chunk really empty ? It does not have any end tags either.
Here is the content from NBTExplorer of that chunk :
Chunk [26, 9] in world at (-6,9)
- CarvingMask : 0 entries
- structures : 1 entry
- UpgradeData: 2 entries
- block_ticks: 0 entries
- entities : 0 entries
- fluid_ticks: 0 entries
- Lights : 8 entries
- PostProcessing : 8 entries
- sections : 24 entries
- DataVersion : 2975
- hasLegacyStructureData : 1
- InhabitedTime : 0
- LastUpdate : 109
- LightPopulated : 0
- Status : noise
- TerrainPopulated : 0
- V : 1
- xPos : -6
- yPos : 9
- HeightMap : 256 integers
