26.4 Snapshot 3 (known as 26.4-snapshot-3 in the launcher) is the third snapshot for Java Edition 26.4, released on October 6, 2026, which adds the ice caves including ice crystals, icicles, ice balls, the frostbite and the Freezing effect, and fixes bugs. Full changelog: https://minecraft.wiki/Java_Edition_26.4-snapshot-3