I don't know why you're having a problem but what I do, which should sidestep it, is in Sigil's Book Browser right click and select Add Blank HTML File. Then replace the <p>(space entity)</p> line with everything between the two body tags in the file you're adding, copying the text from notepad or whatever. Ctl-C everything between the body tags in the original file, then in Sigil Ctl-V after selecting that <p>(space entity)</p> line (click on its line number). That ensures that you get a well formed html file up to the body tag.
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