Java Edition 1.17.1 Pre-release 1

1.17.1 Pre-release 1 (known as 1.17.1-pre1 in the launcher) is the first pre-release for Java Edition 1.17.1, released on June 18, 2021, that changed some game mechanics and fixed some bugs.

Blocks

 * Cauldrons
 * Powder snow now fills cauldrons 2 times faster than before.

Mobs

 * Axolotl
 * Blue Axolotl can now only spawn through breeding.


 * Drowned
 * Increase the drop probability of Copper Ingot from 5% to 11%, and increase the drop probability of each level of Looting spell from 1% to 2%.
 * This change is to match Bedrock Edition's drop rates.


 * Goats
 * Now breeding common goats has a chance to produce screaming goats.
 * Status effects on goats now also apply when the goat is jumping or ramming.


 * Zombies, Zombie Villagers, Husks and Drowned
 * Will no longer pick up glow ink sacs.

General

 * Protocol
 * Client will send the hostname actually used to connect while using DNS-based redirection(SRV) now, reverted to pre-1.17.

Fixes

 * Other
 * Duplication exploit with anvils.