The bug
If you create a Caves type world in 21w43a, go to the top of the world and you'll see Nether rack on the top instead of stone or bedrock. The nether rack goes down by about 10 blocks from 118-128. The bottom of the world seems fine and bedrock and stone generates normally.
Steps to reproduce
1. Create a world with "Caves" generator type
2. Go to the top of world
3. There is nether rack on top
Expected behaviour
Generates with stone and bedrock
Linked issues
Attachments
Comments 4
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Thank you for your report!
We're actually already tracking this issue in MC-239041, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any additional information to the main ticket it would be appreciated.
Please be sure to use the search feature before creating a ticket to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 🛠 Community Support – 📧 Mojang Support – ✍️ Feedback and Suggestions – 💬 Mojira Discord