As anticipation builds for the inaugural Minecraft Live of 2025, scheduled in just under two weeks, Mojang Studios is diligently finalizing key elements of the upcoming spring update, Minecraft 1.21.5. Announced in early January, this update has promised a plethora of exciting features, from innovative blocks to captivating mob variants.
The release of the first pre-release version for Minecraft 1.21.5 signifies that the update is nearing its official launch. Pre-releases serve as crucial stages in development, showcasing new features, adjustments, and a range of bug fixes as developers refine the gameplay experience.
The initial pre-release, designated as Minecraft 1.21.5 pre-release 1, has introduced several technical modifications, primarily focused on enhancing command functions and streamlining network protocols. Alongside these updates, numerous bugs and performance issues have been addressed, significantly improving overall game stability.
Below, you will find a detailed breakdown of the patch notes for Minecraft 1.21.5 pre-release 1.
Minecraft 1.21.5 Pre-Release 1 Patch Notes
Recent Changes
- Inclusion of new Spawn Egg textures for the programmer art texture pack.
Technical Adjustments
- The Resource Pack version has been updated to 55.
- Command arguments that accept inline values—such as loot tables and predicates—have reverted to accepting numbers instead of boolean values.
Developer’s Note: “The original change occurred due to a transition away from NBT for parsing values. We temporarily reverted this to maintain certain functionalities that rely on storage and macro functions. Future updates will aim to restore legacy handling once the necessary improvements are implemented.”
Network Protocol Enhancements
- The clientbound
player_chatpacket will now feature an incrementing index for each message transmitted, starting from 0 upon logging in. - This index increases by one with every message, enhancing the server’s ability to detect missed or reordered chat messages for custom servers.
- Serverbound
chatandchat_command_signedpackets now include a checksum byte to facilitate quicker synchronization between server and client.
Resource Pack Updates from Version 47 to 55
- Updated models for Leaf Litter blocks for improved aesthetics.
Bug Fixes in Minecraft 1.21.5 Pre-Release 1
- MC-170134: Excessive VRAM usage encountered after terrain exploration.
- MC-279350: Performance lag due to unoptimized Leaf litter multipart models.
- MC-280141: Inconsistent display of baby farm animals from spawn eggs with variant differences.
- MC-280241: Misaligned ear textures on Cold Cows.
- MC-280249: Incompatibility of spawn eggs with their original textures in the Programmer Art resource pack.
- MC-280278: Wool texture issue on Sheep using the Programmer Art resource pack.
- MC-280326: Frequent errors experienced during inter-dimensional teleportation.
- MC-280361: Vegetation generation errors when tall vegetation is replaced by fallen trees.
- MC-280474: Persistent TNT explosions regardless of the gamerule
tntExplodes. - MC-280477: TNT still detonates when summoned or dispensed despite
tntExplodesbeing false. - MC-280479: TNT vanishing when ignited with redstone pulses while
tntExplodesis disabled. - MC-280480: Absence of flint and steel ignition sound when attempting to ignite TNT with
tntExplodesfalse. - MC-280493: Existing primed TNT explodes normally if the gamerule is altered to false post-activation.
- MC-280501: Continuous fire extinguishing sound when in rain while on fire.
- MC-280520: Serialization inconsistencies with
ItemDropChanceon item frames lacking items.
The release of Minecraft 1.21.5 pre-release 1 serves as an invitation for the community to gear up for the dynamic spring update. With Minecraft Live 2025 around the corner, taking place on March 22, players can expect subsequent updates to follow a similar cadence to 2024, including timely feature releases shortly after the livestream event.