As of now, the patch notes for Minecraft 1.17 Snapshot 21w21a hasn't been released. In the meantime, you can checkout the patch notes for Minecraft 1.17 Snapshot 21w20a.
After the last major update to Minecraft earlier this year, players found a significant decrease in Diamond Ore out in the wild. It wasn't just your imagination: Minecraft 1.17 (the first major Caves ...
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