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Minecraft 1.13 Update Pre-Release 10 and 9 - New Optimize World Feature! Mob Farms Fixed!


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Source:  xisumavoid



We're now on pre-release 10 and we expect this to be the last pre-release before the full release. That said, unless any major show stopper pops up, we aim to release Update Aquatic for Minecraft: Java Edition on Wednesday, July 18th.




  • Added a few missing subtitles
  • Improved performance
  • Fixed bugs!


  • Added an "Optimize World" button (singleplayer -> edit world -> optimize world), which upgrades an entire world from older version to the latest version in one go
  • Improved performance
  • Fixed bugs!




  • MC-131821 - Cory Scheviak does not appear in credits
  • MC-131822 - Nondescript / confusing error message when attempting to join servers <= 1.13-pre2 using >=1.13-pre3
  • MC-132652 - Username tab completion on non-empty starting strings is offset
  • MC-132657 - Username tab completion appears on the left when invoked without a starting string in the middle of the chat entry line
  • MC-133337 - Crash in org.lwjgl.opengl.GL11.glDrawArrays when opening language settings (caused by Couldn't find glyph for character Ʞ (\ua7b0))
  • MC-133503 - Control settings from 1.12.2 can get completely lost when upgrading to 1.13


  • MC-133653 - Game Crash when creating Superflat world (Void), entering the End, or creating floating islands buffet world
  • MC-133473 - Dead bubble coral fan looks like dead brain coral fan
  • MC-133467 - Mobs Stuck on Flowing Water
  • MC-133421 - The lowest level of flowing water doesn't move mobs
  • MC-133408 - Coral fans and dead coral fans never drop as item
  • MC-128668 - Ocean monuments cut off icebergs
  • MC-127100 - Water and lava influence the flow direction of each other when touching
  • MC-125038 - New world generation doesn't populate edges of old world
  • MC-125007 - World fails to generate decorations on seemingly random quarter chunks
  • MC-122216 - /execute if blocks only returning 1/0 for "result"
  • MC-59729 - /replaceitem doesn't work with chest or hopper minecarts


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