Dungeons and Overworld Fossils are not able to be located with the /locate structure command as they are not set as structures.
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violine1101
Thank you for your report!
We're tracking this issue in MC-107829 and MC-174499, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main tickets it would be appreciated.
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Duplicate of MC-174499 and MC-107829.