Well, I'm not sure if I got this right, because I had to quit before I was sure I had figured out what was going on, but does this make sense:
In a body {...} statement
1) margin: property ( as opposed to margin-top: etc)
body {margin: 1em; }
Is not found by Quality Check
Is properly found and stripped by Modify Epub
2) a declaration without a trailing semi-colon (last or only declaration in rule)
body {margin-top: 1em }
Is found by Quality Check
Is not found by Modify Epub
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