Tutorials/Downgrading

Downgrading is the act of loading a world in an older version than the version of that world last loaded. Downgrading is dangerous; it causes the world to be prone to corruption, data loss or crash.

Downgrading screen
In the singleplayer menu, if a world was last loaded in a version newer than the one being run, the version name of the world is displayed in red. When moving the mouse over the world, an exclamation mark appears to the left of the play button in the world icon on the left. While hovering over the world icon, the exclamation mark turns red and a tooltip appears with red text stating: "World was saved in a newer version, loading this world could cause problems!". Trying to load the world causes a screen to pop up with text that says: "Downgrading a world is not supported This world was last played in version ; you are on version . Downgrading a world could cause corruption — we cannot guarantee that it will load or work. If you still want to continue, please make a backup!" The screen also has three buttons: "Create Backup and Load", "I know what I'm doing!", and "Cancel". The actions when clicking are shown in the table below.

When downgrading a world, the version of the world when it was last loaded will change to the current version.

Consequences
The consequences of downgrading a world are of follows:
 * Any loaded chunks in the world update to the new chunks.
 * Any blocks, items, entities, enchantments, effects, particles, sounds, biomes and advancements that don't exist in that version are removed from the world.
 * Downgrading a world can cause the world to corrupt, lose data, and possibly crash.