I am currently restoring the trail ruins, and i tried generating a ton to see how the upper group buildings work, i did /place a bunch of times and didn't get it, so I loaded up the structure with a structure block and found that the jigsaws are entirely empty, causing the group_upper buildings not to generate at all in a natural setting
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Thank you for your report!
We're actually already tracking this issue in MC-264093, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote or any additional information to the main ticket it would be appreciated.
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