OnGround becomes 0b for players when they walk up against one-high solid blocks

teleport's rotational arguments use sender's rotation rather than context's rotation

distance selectors use information from prior entity locations, giving surprising results

datapacks load functions unreliably

certain zip files do not work as datapacks

Exiting world does not release file handle to zipped datapack / resourcepack

Teleporting to another dimension loses some client states

Disabled datapacks still override vanilla structures (e.g. igloo)

local coordinates (^ ^ ^5) require an entity even after execute-facing

performance problems with "execute" command

All types of animals spawning in blocks and suffocating during terrain generation

standing atop a boat sitting atop a second boat in multiplayer gets you kicked for 'flying is not allowed on this server'

"execute store" on "double" data types uses only 'float' rather than 'double' precision in intermediate scale calculation

inconsistent behavior when teleporting a player's root vehicle

Too long scoreboard objectives and team names are not detected when commands are parsed

stereo sound not working properly (left versus right speaker)

ConcurrentModificationException when running "scoreboard players reset *"

hang on 'waiting for chunk' and/or fatal background exceptions when teleporting to new chunks in a busy gameloop

team color commands don't work properly

Crash upon world load: java.lang.NullPointerException: Exception in server tick loop

Launcher does not work with custom options (like 'minecraft screen resolution') in 1.13 snapshot profiles

"execute as...if" works incorrectly

/tellraw does not work

NullPointerException when using conditional command within a function

execute/selectors are broken

Teleporting back to spawn chunks causes elytra to quit working until relog

No more chunks generate past X=1776 or Z=1776 in my world

Command block logic sometimes fails arbitrarily

The sound of blocking with a shield is only hearable by other players (not the person blocking)

some chunks do not render when standing near chunk boundaries

'Glowing' interacts incorrectly with culling of sections/chunks, causing glowing mobs to immediately disappear as the player crosses chunk boundaries

At edge of render distance, objects become invisible when looking straight at them, but are visible when turning your head away

when riding horse, logging out, and logging in, client thinks you're dismounted

wearing frost walker boots while riding a horse no longer frosts

Frost Walker II is under-powered

chests and mobs are sometimes transparent

Ores with Spawn Size '1' or '2' don't appear in the Customized world

/spreadplayers occasionally suffocates players

loot table "spreading large stacks" will overwrite existing items

'Mending' is impossibly rare

LootTable does not respect rolls

MinecartChest using abandoned_mineshaft.json loot table does not wait for chest to be opened

unintended changes in mob drops with loot tables

command 'effect @a clear' cleared effects from HUD, but not from gameplay

saving the game can appear to happen 'mid-tick', violating command block contracts

Unconditional impulse command blocks interact unexpectedly with conditionMet

same world seed does not generate same terrain

Minecart with uuid summoned atop detector rail via fill clock cannot be /kill'd

signs do not seem to participate in occlusion culling, lowering FPS in regions with many signs