Contents (6)
Java What changed in 1.21.9-pre1
Everything below is measured by comparing the game files of 25w37a with 1.21.9-pre1 — not copied from patch notes.
New in-game text 9
| Key | Text |
|---|---|
commands.fetchprofile.summon_mannequin | Summon Mannequin |
commands.setworldspawn.success.new | Set the world spawn point to %s, %s, %s [%s, %s] in %s |
commands.spawnpoint.success.multiple.new | Set spawn point to %s, %s, %s [%s, %s] in %s for %s players |
commands.spawnpoint.success.single.new | Set spawn point to %s, %s, %s [%s, %s] in %s for %s |
gamerule.enableCommandBlocks | Enable Command Blocks |
mco.configure.world.commandBlocks | Command Blocks |
mco.configure.world.spawnMonsters | Spawn Monsters |
mco.configure.world.spawn_toggle.message | Turning this option off will remove all existing entities of that type |
mco.configure.world.spawn_toggle.message.npc | Turning this option off will remove all existing entities of that type, like Villagers |
Fixes 29
Read from Mojang’s own release notes for Minecraft 1.21.9 Pre-Release 1, published 2025-09-16. Every entry keeps its original bug ID.
29 issues fixed, read from Mojang’s own patch notes. Each entry keeps its original bug ID.
Fixed bugs in 1.21.9 Pre-Release 1 29
MC-160528End portals do not negate fall damageMC-243759Explosions won't damage an entity if the distance to its eyes is 0MC-300257Lightning does not reset copper golem oxidationMC-300294Copper golems pathfind to chests incorrectlyMC-300687The copper chains and bars aren't organized correctly in the Creative inventoryMC-300881The skin preview in the skin reporting screen is no longer interactiveMC-301409Acceleration power of fireballs and wind charges gets halved when they are redirected by explosionsMC-301414Scraping oxidation off double chests doesn't produce particles on the half of the chest that wasn’t directly interacted withMC-301424entity_data item component detection is broken in resource packsMC-301541Copper golems no longer sort items when in minecartsMC-301569Sounds of copper chests and all variants are too quiet and sound low-quality compared to beforeMC-301573Relative teleportation across dimensions is inconsistentMC-301798Copper golems do not open chests with specific transparent/non-full blocks above themMC-301814CustomNameVisible does not work for mannequins (for the name, not the NPC annotationMC-301815Mannequin data is sometimes lost when using spawn eggsMC-301819Mannequins' name tags are visible when on a team and riddenMC-301862When clicking a command suggestion in chat, it occasionally selects half of the new wordMC-301883Entities going through portals with their Motion set to more than 10 on an axis have their Motion tag resetMC-301893When a copper golem is leashed by a player and then oxidizes into a statue, it will not drop the leadMC-301951Misleading description for operator_user_permission_level in server management protocol documentationMC-301979Copper golems no longer properly check chestsMC-301984Teleporting a player to their own position is now jittery/frozenMC-301991deprecated.json has some renamed keys pointing to text values instead of the new keysMC-302032Static profiles no longer resolve texture data unless an id or name is providedMC-302089Game crashes when flying mobs start pathfinding in debug modeMC-302092Crash when placing iron bars next to stairs, when stairs are added to #bars tagMC-302094Crash when adding blocks to #copper_chests then placing it next to actual copper chestsMC-302095Crash when adding blocks to #lightning_rods and summoning a lightning over itMC-302096Crash when adding blocks to #wooden_shelves, placing it next to wooden shelf, then powering the shelf
Development cycle
This build was part of the run-up to 1.21.9. Everything tested here landed in that release.