The CP (compact policy) value must be enclosed in double quotes. Which means that:
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<meta http-equiv="P3P" content="policyref='http://www.example.com/w3c/p3p.xml', CP='NID DSP NOI COR'" />
It should render as:
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<meta http-equiv="P3P" content='policyref="http://www.example.com/w3c/p3p.xml", CP="NID DSP NOI COR"' />
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<meta http-equiv="P3P" content='policyref="http://www.example.com/w3c/p3p.xml", CP="NID DSP NOI COR"' />
<link rel="P3Pv1" href="/w3c/p3p.xml" />