Minecraft:Java Edition 1.20.3 Pre-Release 1

Template:Infobox version 1.20.3 Pre-Release 1 (known as 1.20.3-pre1 in the launcher) is the first pre-release for Minecraft:Java Edition 1.20.3, released on November 20, 2023,<ref>Template:Mcnet</ref> which makes changes to world Minecraft:resource packs and fixes bugs.

Changes

The resource pack version is now 22.
Changes to downloaded/world resource pack handling.
- Changes apply to world resource packs (Template:Samp), Realms resource packs and resource packs controlled by dedicated servers.
UI download screen has been replaced with a toast.
World resource pack application starts together with chunk loading.
Downloaded packs are now stored in downloads directory (with different file organization than old Template:Cd)
- Files in this directory are no longer automatically cleaned (previously only up to 10 packs were kept).
- Additionally, inside this directory there is also log file Template:Samp that stores information about downloaded files for debug purposes.
Downloaded packs now have unique id (GUID/UUID) that can be used to differentiate them.
- This value for dedicated server pack can be configured with the Template:Cd option in Template:Samp.
- If the value is missing, it is generated based on URL.
- If hash of a pack is not set, this pack is redownloaded before every application.
- Previously, if hash was missing, the latest downloaded version of a pack was applied.

General

Some additional options are added for 3rd-party servers software:
- Client can now accept multiple server resource packs.
- New packet was added to un-apply server resource packs.
- Resource packs are no longer cleaned when entering configuration phase.

These additions only take effect when the Minecraft:Update 1.21 experimental data pack is enabled.