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There is no general fix for this. You can always end up with duplicated images when converting formats that dont have the concept of a cover. I have committed (an untested) fix to change the ODT input plugin to not use the first image as cover. However, you can still get duplicated images if for instance, a user adds an ODT to calibre, which gets its first image as the cover. Then convert, which will set that extracted first image as a cover. For these kinds of problems, there is the --remove-first-image option.
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