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Minecraft 25w09a

Weekly work-in-progress build. Things break and get removed again. Full source data for this version is extracted and browsable below.

2,650 names shipped in this version. Each result opens the wiki page for that thing.

Contents (7)
  1. What changed in 25w09a
  2. New in-game text
  3. Reworded text
  4. Fixes
  5. Development cycle
  6. Browse this version
  7. Neighbouring versions

Java What changed in 25w09a

Everything below is measured by comparing the game files of 25w08a with 25w09a — not copied from patch notes.

New in-game text 16

KeyText
snbt.parser.empty_keyKey cannot be empty
snbt.parser.expected_binary_numeralExpected a binary number
snbt.parser.expected_decimal_numeralExpected a decimal number
snbt.parser.expected_float_typeExpected a floating point number
snbt.parser.expected_hex_escapeExpected a character literal of length %s
snbt.parser.expected_hex_numeralExpected a hexadecimal number
snbt.parser.expected_integer_typeExpected an integer number
snbt.parser.expected_non_negative_numberExpected a non-negative number
snbt.parser.expected_unquoted_stringExpected a valid unquoted string
snbt.parser.invalid_array_element_typeInvalid array element type
snbt.parser.invalid_character_nameInvalid Unicode character name
snbt.parser.invalid_string_contentsInvalid string contents
snbt.parser.invalid_unquoted_startUnquoted strings can't start with digits 0-9, + or -
snbt.parser.leading_zero_not_allowedDecimal numbers can't start with 0
snbt.parser.number_parse_failureFailed to parse number: %s
snbt.parser.undescore_not_allowedUnderscore characters are not allowed at the start or end of a number

Reworded text 29

Wording Mojang changed in this version.

KeyBeforeAfter
mco.backup.nobackupsThis realm doesn't have any backups currently.This Realm doesn't have any backups currently.
mco.backup.restoringRestoring your realmRestoring your Realm
mco.brokenworld.nonowner.errorPlease wait for the realm owner to reset the worldPlease wait for the Realm owner to reset the world
mco.configure.world.close.question.line1Your realm will become unavailable.Your Realm will become unavailable.
mco.configure.world.closingClosing the realm...Closing the Realm...
mco.configure.world.delete.question.line1Your realm will be permanently deletedYour Realm will be permanently deleted
mco.configure.world.leave.question.line1If you leave this realm you won't see it unless you are invited againIf you leave this Realm you won't see it unless you are invited again
mco.configure.world.openingOpening the realm...Opening the Realm...
mco.configure.world.resourcepack.questionYou need a custom resource pack to play on this realm Do you want to download it and play?You need a custom resource pack to play on this Realm Do you want to download it and play?
mco.configure.world.resourcepack.question.line1You need a custom resource pack to play on this realmYou need a custom resource pack to play on this Realm
mco.configure.world.slot.switch.question.line1Your realm will be switched to another worldYour Realm will be switched to another world
mco.connect.connectingConnecting to the realm...Connecting to the Realm...
mco.connect.failedFailed to connect to the realmFailed to connect to the Realm
mco.create.world.subtitleOptionally, select what world to put on your new realmOptionally, select what world to put on your new Realm
mco.create.world.waitCreating the realm...Creating the Realm...
mco.download.confirmation.line2You won't be able to upload this world to your realm againYou won't be able to upload this world to your Realm again
mco.download.confirmation.oversizedThe world you are going to download is larger than %s You won't be able to upload this world to your realm againThe world you are going to download is larger than %s You won't be able to upload this world to your Realm again
mco.minigame.world.restore.question.line1The minigame will end and your realm will be restored.The minigame will end and your Realm will be restored.
mco.reset.world.warningThis will replace the current world of your realmThis will replace the current world of your Realm
mco.selectServer.closedClosed realmClosed Realm
mco.selectServer.closeserverClose realmClose Realm
mco.selectServer.configureRealmConfigure realmConfigure Realm
mco.selectServer.create.subtitleSelect what world to put on your new realmSelect what world to put on your new Realm
mco.selectServer.expiredExpired realmExpired Realm
mco.selectServer.openOpen realmOpen Realm
mco.selectServer.openserverOpen realmOpen Realm
mco.selectServer.uninitializedClick to start your new realm!Click to start your new Realm!
mco.trial.message.line1Want to get your own realm?Want to get your own Realm?
mco.upload.close.failureCould not close your realm, please try again laterCould not close your Realm, please try again later

Fixes 19

Read from Mojang’s own release notes for Minecraft Snapshot 25w09a, published 2025-02-26. Every entry keeps its original bug ID.

19 issues fixed, read from Mojang’s own patch notes. Each entry keeps its original bug ID.

Fixed bugs in 25w09a 19

  • MC-168262 Dead bushes cannot be placed on farmland
  • MC-236100 End crystal beam appears to be black
  • MC-276861 The player can sometimes teleport through blocked end portals when moving very fast
  • MC-279229 SNBT text components prevent \n and \t from working
  • MC-279236 Flying into water with an elytra puts the player into an erroneous state
  • MC-279250 SNBT text components prevent unicode escapes from working
  • MC-279252 Changing a single line of a sign with /data is no longer possible in some situations
  • MC-279278 Strafing twice in rapid succession while walking forward causes player to sprint
  • MC-279928 Beacon beam clips into beacon block when far enough away
  • MC-279932 Beacon beam disappears and reappears when approaching it
  • MC-279942 Beacon beam can render over fog when outside render distance
  • MC-279947 Snout of the new cow model is offset vertically by 0.1 pixels
  • MC-280022 Players can be lit by lava while stepping onto solid blocks next to it
  • MC-280033 Beacon beams render beyond client render distance
  • MC-280121 Leaf litter can be placed on walls and fences
  • MC-280123 Short dry grass and tall dry grass aren't randomly offset, unlike similar blocks
  • MC-280155 Random ticks can cause entity build-up in lazy chunks
  • MC-280170 Goats can no longer ram armor stands unless the game rule mobGriefing is set to false
  • MC-280211 End crystal beams cause OpenGL errors with glDebugVerbosity set to 3

Development cycle

This build was part of the run-up to 1.21.5. Everything tested here landed in that release.

Browse this version