IndexOutOfBoundsException occurs instead of a "Bad packet id" message

"migrated": false returned by /authenticate endpoint even for migrated accounts

"Invalid book tag" is not translatable

small_fireball entity ID is broken

Update light packet uses the wrong mask for empty block light

Failed backup message isn't translated properly

The sound "mob/panda/worried/worried1" never plays

Iron trapdoor opens and closes captions are reversed

Crash when generating at exactly the top of the world

Worldborder set size error message translation keys have an extra period at the end

Superflat preset names do not update if the language is changed after the presets GUI has been opened

End gateway magenta beam height varies based on the distance from the player

Force JVM crash fails to crash the JVM when LWJGL is in debug mode, instead merely crashing the game

Force JVM crash doesn't work with left control, only right

Dimension arguments fail to properly serialize, breaking "/chunk in" and "/execute in" in multiplayer

Entities automatically jump when falling into water of any depth from certain heights

Entities automatically jump when falling into 1-block-deep water from certain heights

PacketBuffer.writeString's max length is in bytes, while readString is in characters

Sticky pistons pull glazed teracotta

The GL debug message callbacks are never freed, causing memory leak warnings

The image write callback is never freed, leaking small amounts of memory for each screenshot

Crash when launching the game with LWJGL allocation debugging enabled

Uncaught exception handler doesn't log the stacktrace

Re-running the data generator in the same folder causes previously generated -reports and- .snbt files to be deleted

Data generators sometimes hang forever (and always wait to exit after finishing) due to data fixers

Commands data report creates a server instance for no reason

Chunk data packet allocates an extra byte for each section using GlobalPalette

Command tab completion does not work in command blocks with command suggestions off

Certain blocks on chunk borders cause many blocks in the same chunk to be updated when upgrading from 1.12.2

X-axis portals break when upgrading from 1.12.2 when certain blocks are above/near them

Command block minecarts disappear upon reloading the world

Flint and steel in a dispenser does not lose durability when used to ignite TNT

Beacon block entity contains code for custom names, despite not storing it to NBT and the beacon GUI not having one

Command block minecart data walker never runs due to comparing different types

Crash on startup with a debug log4j config

Several GUIs are not closed when pressing ESC

Tab-completion in command blocks no longer works

Normal players can use player selectors in /msg command

Cursor is offset from actual mouse location when opening GUIs while moving mouse

Mobs summoned using /summon have no weapons

/teleport with rotation does not work

Unhandled exceptions in commands just dump the exception into chat, without the "unknown error" message

Commands aliases do not display syntax help/tab complete correctly