was creating a new world using floating island on buffet using Soulsand Vally as the biome and the loading box would stay at 0%.
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Thank you for your report!
We're actually already tracking this issue in MC-171020, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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I cannot reproduce the bug. May you attach the log file so the issue can be diagnosed.