Minecraft wiki entry for Flattening, associated text: 1.13 modified the IDs of many blocks, items, biomes, particles, paintings, entities, statistics and sound events, removed numeric IDs, added and removed some block states, and changed NBT tags and display names.[1] This change is known as "The Flattening". The contents of this page serve as a comparison between the identifiers of versions 1.12.2 and 1.13. This was not done to Bedrock Edition, keeping most Bedrock item IDs the same.