That DOCTYPE is okay for html5 in Sigil-0.9.1 and so the html tag is simply missing the xml namespace attribute to tell it how to interpret the xml. This is needed for Preview/BookView to interpret the file as xhtml not some dialect of html.
So edit the <html> tag and add the attribute:
xmlns="http://www.w3.org/1999/xhtml"
And you will see all appears as normal.
KevinH
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