Java Edition 1.21.5 Pre-Release 1

Minecraft 1.21.5 Pre-Release 1
1.21.5-pre1.jpg: Infobox image for Minecraft 1.21.5 Pre-Release 1 the version in Minecraft
Java Edition 1.21.5 Pre-Release 1.png: Infobox image for Minecraft 1.21.5 Pre-Release 1 the version in Minecraft
Edition

Java Edition

Release date

March 11, 2025

Type

Pre-release

Pre-release for

1.21.5

Downloads

Client (.json)
Server

Obfuscation maps

Client
Server

Protocol version

 dec: 1073742063
 hex: 400000EF

Data version

4320

Resource pack format

55

Data pack format

70

Minimum Java version

Java SE 21

◄◄  1.21.4 1.21.5 1.21.6 ►►

◄  25w10a

1.21.5 Pre-Release 1

1.21.5 Pre-release 2 ► 

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    "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition  1.21.4|<span style=\"margin-right:-0.35em\">◄</span>◄   1.21.4]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.21.5|1.21.5]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition  1.21.6|  1.21.6 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition  25w10a|◄   25w10a]]\n</td>\n<td style=\"padding: 0.4em\">''' 1.21.5 Pre-Release 1'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition  1.21.5 Pre-release 2|  1.21.5 Pre-release 2 ►]]\n</td>\n</tr>\n</table>"
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1.21.5 Pre-Release 1 (known as 1.21.5-pre1 in the launcher) is the first pre-release for Java Edition 1.21.5, released on March 11, 2025.[1] This is the first pre-release released in 2025.

Changes

Items

Spawn eggs

World generation

Fallen trees

  • The longer versions of fallen birch trees now generate properly.
    • This version is up to 15 blocks long, as opposed to the shorter version which can only reach 8 blocks at most.

Command format

General

  • Arguments in commands that accept inline values like loot tables, predicates, modifiers, data components, formatted text (/loot, /give, /tellraw, /execute if predicate, data components in /execute if items, etc.) have been reverted to accept numbers in place of booleans.

General

Network protocol

  • The client-bound player_chat packet now contains an index increasing for every message sent to the client.
    • The index starts at 0 when logging in (or is reset by configuration phase and the login packet).
    • For every message, the server should increment this value by 1.
    • If this value updates in an unexpected way, the client will disconnect.
    • As the protocol requires that every chat packet reaches the client in produced order, the goal is to enable faster detection of missed/reordered chat messages for custom server developers.
  • The server-bound chat and chat_command_signed packets now contain a checksum byte along with the 'last seen' update.
    • This is a simple hash of the 'last seen' signatures which should be reconstructed by the server, allowing quicker detection of desynchronized state.
    • This can be passed as 0 to disable the check, for compatibility with protocol translation.

Resource pack

  • The version is now 55.
  • Tweaked leaf litter block models.

Fixes

15 issues fixed

From released versions before 1.21

  • MC-170134 – Minecraft uses several times more VRAM than needed after exploring terrain for a while.

From the 1.21.5 development versions

  • MC-279350 – Leaf litter multipart model system is unoptimized, causing render lag.
  • MC-280141 – Baby farm animals from spawn eggs with a variant differing from the parent flash the wrong variant initially.
  • MC-280241 – Cold Cows have improperly mirrored and incorrectly aligned ear textures.
  • MC-280249 – Spawn eggs don't use their old textures with the Programmer Art resource pack enabled.
  • MC-280278 – Sheep wool uses 1.14 texture with Programmer Art resource pack enabled.
  • MC-280326 – When teleporting across dimensions an error is often thrown.
  • MC-280361 – When a fallen tree replaces the bottom half of tall vegetation, the top part of the vegetation still generates.

From the previous development version

  • MC-280474 – TNT minecarts explode regardless of tntExplodes gamerule.
  • MC-280477 – TNT still explodes when summoned or dispensed while tntExplodes gamerule is false.
  • MC-280479 – TNT is completely deleted when attempting to ignite it using redstone pulses when the "tntExplodes" gamerule is disabled.
  • MC-280480 – No flint and steel clicking sound when attempting to ignite. TNT with a flint and steel when the "tntExplodes" gamerule is disabled.
  • MC-280493 – If the tntExplodes game rule is changed to false while primed TNT already exists in the world, the primed TNT explodes as normal.
  • MC-280501 – The "Fire extinguishes" sound plays every game tick while on fire in rain.
  • MC-280520 – ItemDropChance on an item frame is not serialized when there is no item anymore, leading to inconsistencies.

Videos

Video made by Slicedlime:

References

  1. ↑ "Minecraft 1.21.5 Pre-Release 1" – Minecraft.net, March 11, 2025.

Navigation

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(Guide)
1.21.11‡

* indicates a reupload | † indicates a lost version | ‡ indicates a version with a variant

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