Solution for "Rich snippets not showing"

During my microdata coding i quite accidentally realized, that "rich snippets are not showing" doesn't always mean "rich snippets not working"! My research was about nesting and inheritance of Schema.org's classes, and, playing with the Google's structured data testing tool, i detected a case where my microdata markup was correctly validated and worked properly, but rich snippets of this code weren't showing. After some tests i got to know about two causes of not shown rich snippets:
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March 21, 2014