Java Edition 1.17 Pre-release 1

1.17 Pre-release 1 is the first pre-release for Java Edition 1.17, released on May 27, 2021, which re-added candles and changes their lit texture, adds advancements, allows azaleas to be placed in flower pots, adds a glowing sign outer-glow, and fixes bugs.

Blocks

 * Candles
 * Readded candles to the creative inventory.
 * Candles can be crafted again.

Gameplay

 * Advancements
 * Added eleven new advancements:
 * Whatever Floats Your Goat!
 * Float in a boat with a goat.
 * Wax on
 * Apply wax to a copper block.
 * Wax off
 * Scrape wax off a copper block.
 * The Cutest Predator
 * Catch an axolotl in a bucket.
 * The Healing Power of Friendship!
 * Team up with an axolotl and win a fight.
 * Glow and Behold
 * Make a sign glow.
 * Light as a Rabbit
 * Walk on powder snow with leather boots.
 * Surge Protector!
 * Have lightning strike a lightning rod near a villager without setting the area on fire.
 * Is it a Bird?
 * Look at a parrot through a spyglass.
 * Is it a Balloon?
 * Look at a ghast through a spyglass.
 * Is it a Plane?
 * Look at a dragon through a spyglass.

Blocks

 * Azalea and Flowering Azalea
 * Can now be placed on flower pots.


 * Candles
 * The texture when lit has been changed.


 * Signs
 * Glowing text on signs now has an outer glow, making text in dark colors more visible in the dark.

Experimental
Changes have been made to the official Caves & Cliffs world generation preview datapack, which gives early access to the world generation coming in Java Edition 1.18.