https://minecraft.net/en-us/article/minecraft-snapshot-17w17a
Last week was the last week to introduce new features for 1.12, and starting
from this week we are focusing on polishing the new features, fixing as many
bugs as possible and optimizing the game.
Changes in snapshot 17w17a
Added lots of new advancements and moved existing ones around
Gave terracotta blocks unique colours on the map
Tweaks to the difficulty of the Illusioner
Reverted the purple skulker colour, sorry about that!
New sound effects, including new note blocks notes!
Made the tooltips in advancements UI overlay the screen
Technical: Added "UpdateLastExecution" nbt tag to command blocks, useful
for loops
Technical: Added bulk-granting/revoking to the /advancement command
Technical: Allow advancements to trigger commands as rewards
Technical: Optimized the recipe book a little
Technical: Advancement icons now allow data values
Fixed bug MC-114971 - Missing usage translation for '/advancement test'
command
Fixed bug MC-114979 - advancement command doesn't allow bulk
grant/revoking
Fixed bug MC-115056 - "Remote Gateway" advancement cannot be obtained by
using ender pearls
Fixed bug MC-115170 - Advancements Test Command Success Uses the Wrong
Translation
Fixed bug MC-115173 - Unsuccessful advancement test command has player
and advancement name interchanged
Fixed bug MC-115574 - "Sniper Duel" advancement triggered when killing
non-skeleton mob at distance
Fixed bug MC-115740 - Inconsistent error message for /advancement grant
@p *
Fixed bug MC-115805 - Fences/panes/walls/bars/torches connect to a number
of non-solid blocks
Fixed bug MC-115821 - Tooltips with long titles in the advancements menu
are cut off
Fixed bug MC-115880 - 'Take Aim' advancement granted by projectiles other
than arrows
Fixed bug MC-115936 - Narrator does not properly read output from /say,
/tell and /tellraw command
Fixed bug MC-115940 - Division by zero crash with alternating /recipe
commands
Fixed bug MC-116016 - Advancement "adventure/trade" uses criteria named
"shot_arrow"
Fixed bug MC-116245 - "Zombie Doctor" advancement description has a
period, while others don't
Fixed bug MC-116471 - Conditional command blocks SuccessCount doesn't
update
Fixed bug MC-116514 - "durability" option for item-based triggers
succeeds for items without durability
Fixed bug MC-116516 - "item_durability_changed" triggers when base change
is 0, but not when Unbreaking reduces the change to 0
Fixed bug MC-116617 - New AutoCraft Functionality Allows Spawning
Arbitrary Items
Fixed bug MC-116650 - Wooden fences connect to nether brick fences
Added some new bugs!