Minecraft:Java Edition 1.21.1 Release Candidate 1

1.21.1 Release Candidate 1 (known as 1.21.1-rc1 in the Minecraft:launcher) is the first and only Minecraft:release candidate for Minecraft:Java Edition 1.21.1, released on August 7, 2024,<ref name="mcnet">Template:Cite</ref> which fixes two critical exploits including update suppression and adds two new Minecraft:languages.

Additions

General

Minecraft:Languages

• Added support for Tzotzil and Belarusian (Latin) languages.

Fixes

Private issues

• Fixed block entity swap based Minecraft:update suppression as shown in this video.
• Fixed an exploit which allows modified clients to crash the server by requesting command completion for a malicious target selector input, causing a crash due to stack exhaustion.