https://wiki.sasgaming.net/index.php?action=history&feed=atom&title=Minecraft%3AJava_Edition_1.21.5_Pre-Release_1Minecraft:Java Edition 1.21.5 Pre-Release 1 - Revision history2026-09-08T14:13:30ZRevision history for this page on the wikiMediaWiki 1.43.8https://wiki.sasgaming.net/index.php?title=Minecraft:Java_Edition_1.21.5_Pre-Release_1&diff=194672&oldid=prevSyncBot: Sync: new page from Minecraft2026-09-06T11:12:31Z<p>Sync: new page from Minecraft</p>
<p><b>New page</b></p><div>{{Infobox version<br />
|title=Minecraft 1.21.5 Pre-Release 1<br />
|image=1.21.5-pre1.jpg<br />
|image2=Java Edition 1.21.5 Pre-Release 1.png<br />
|edition=Java<br />
|type=Pre-release<br />
|date=March 11, 2025<br />
|jsonhash=95d86e05c61b1b8fbaa589aecd909a28f5563629 |jsonfile=1.21.5-pre1<br />
|clienthash=8b708817d1997e46bcdd03bdf106533d05ff1bfa<br />
|clientmap=bbbdc77f9732e640f6a6d91de87a3836a93ce1b9<br />
|serverhash=b663ce11b5951546a74947c1896e0d4713188833<br />
|servermap=cdfaeb62e5d35aeeaa0c648fdd8dc28309791377<br />
|parent=1.21.5<br />
|prevparent=1.21.4<br />
|prev=25w10a<br />
|next=1.21.5 Pre-release 2<br />
|nextparent=1.21.6<br />
}}<onlyinclude><br />
<br />
'''1.21.5 Pre-Release 1''' (known as '''1.21.5-pre1''' in the [[Minecraft:launcher]]) is the first pre-release for [[Minecraft:Java Edition 1.21.5]], released on March 11, 2025.<ref>{{Mcnet|minecraft-1-21-5-pre-release-1|Minecraft 1.21.5 Pre-Release 1|March 11, 2025}}</ref> This is the first pre-release released in 2025.<br />
<br />
== Changes ==<br />
<br />
=== Items ===<br />
'''[[Minecraft:Spawn eggs]]'''<br />
* Added textures for [[Minecraft:Programmer Art]] resource pack.<br />
<br />
=== World generation ===<br />
'''[[Minecraft:Fallen tree]]s'''<br />
* The longer versions of fallen birch trees now generate properly.<br />
** This version is up to 15 blocks long, as opposed to the shorter version which can only reach 8 blocks at most.<br />
<br />
=== Command format ===<br />
'''General'''<br />
* Arguments in commands that accept inline values like loot tables, predicates, modifiers, data components, formatted text ({{cmd|loot}}, {{cmd|give}}, {{cmd|tellraw}}, {{cmd|execute if predicate}}, data components in {{cmd|execute if items}}, etc.) have been reverted to accept numbers in place of booleans.<br />
<br />
=== General ===<br />
'''Network protocol'''<br />
* The client-bound {{cd|player_chat}} packet now contains an index increasing for every message sent to the client.<br />
** The index starts at 0 when logging in (or is reset by configuration phase and the {{cd|login}} packet).<br />
** For every message, the server should increment this value by 1.<br />
** If this value updates in an unexpected way, the client will disconnect.<br />
** 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.<br />
* The server-bound {{cd|chat}} and {{cd|chat_command_signed}} packets now contain a checksum byte along with the 'last seen' update.<br />
** This is a simple hash of the 'last seen' signatures which should be reconstructed by the server, allowing quicker detection of desynchronized state.<br />
** This can be passed as {{cd|0}} to disable the check, for compatibility with protocol translation.<br />
<br />
'''[[Minecraft:Resource pack]]'''<br />
* The version is now {{cd|55}}.<br />
* Tweaked [[Minecraft:leaf litter]] block models.<br />
<br />
== Fixes ==<br />
{{fixes|project=MC|fixedin=1.21.5 Pre-release 1<br />
|;From released versions before 1.21<br />
|170134|Minecraft uses several times more VRAM than needed after exploring terrain for a while.<br />
|;From the 1.21.5 development versions<br />
|279350|Leaf litter multipart model system is unoptimized, causing render lag.<br />
|280141|Baby farm animals from spawn eggs with a variant differing from the parent flash the wrong variant initially.<br />
|280241|Cold Cows have improperly mirrored and incorrectly aligned ear textures.<br />
|280249|Spawn eggs don't use their old textures with the Programmer Art resource pack enabled.<br />
|280278|Sheep wool uses 1.14 texture with Programmer Art resource pack enabled.<br />
|280326|When teleporting across dimensions an error is often thrown.<br />
|280361|When a fallen tree replaces the bottom half of tall vegetation, the top part of the vegetation still generates.<br />
|;From the previous development version<br />
|280474|TNT minecarts explode regardless of {{cd|tntExplodes}} gamerule.<br />
|280477|TNT still explodes when summoned or dispensed while {{cd|tntExplodes}} gamerule is false.<br />
|280479|TNT is completely deleted when attempting to ignite it using redstone pulses when the "{{cd|tntExplodes}}" gamerule is disabled.<br />
|280480|No flint and steel clicking sound when attempting to ignite. TNT with a flint and steel when the "{{cd|tntExplodes}}" gamerule is disabled.<br />
|280493|If the {{cd|tntExplodes}} game rule is changed to false while primed TNT already exists in the world, the primed TNT explodes as normal.<br />
|280501|The "Fire extinguishes" sound plays every game tick while on fire in rain.<br />
|280520|{{cd|ItemDropChance}} on an item frame is not serialized when there is no item anymore, leading to inconsistencies.<br />
}}</onlyinclude><br />
<br />
== Videos ==<br />
{{slicedlime|DIUd4fWkm3Y}}<br />
<br />
== References ==<br />
{{reflist}}<br />
<br />
== Navigation ==<br />
{{Navbox Java Edition versions|1.2x}}<br />
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