Minecraft 1.21.9-pre2

Everything below is measured by comparing the game files of 1.21.9-pre1 with 1.21.9-pre2 — not copied from patch notes.

Read from Mojang’s own release notes for Minecraft 1.21.9 Pre-Release 2, published 2025-09-19. Every entry keeps its original bug ID.

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

Fixed bugs in 1.21.9 Pre-Release 2 11

• MC-300362 Copper golems do not oxidize when doDaylightCycle is disabled
• MC-301566 Occasional sound crash on resource pack reload
• MC-301706 Server Management Protocol does not support parameters as object (by-name
• MC-301770 The below_name plate is not displayed higher for players and mannequins named “deadmau5”
• MC-301963 Copper golems cause huge lag spikes when checking chests
• MC-302088 Oxidized Copper Golems take an extremely long time to turn into a statue
• MC-302112 Posed mannequins don't use the correct hitbox
• MC-302117 Text display billboarding is broken
• MC-302120 Dimension-specific world spawn point causes mob spawning in other dimensions to fail
• MC-302148 Copper Golem does not get close enough to search the chest, getting permanently stuck
• MC-302164 Breaking change to /setworldspawn and /spawnpoint in minor datapack version

This build was part of the run-up to 1.21.9. Everything tested here landed in that release.