It seems to have something to do with CSP processing and XHTML. I get several repetitions of the following:
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Content Security Policy: Couldn’t process unknown directive ‘noscript-marker’
Content Security Policy: Couldn’t process unknown directive ‘script-src-elem’
Content Security Policy: Couldn’t process unknown directive ‘script-src-attr’
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XML Document: temporary replacing <html xmlns="http://www.w3.org/1999/xhtml"> with <HTML>
DocumentCSP.js:42:17
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Content-Security-Policy: default-src 'none'; script-src 'self'; style-src 'self'; frame-ancestors 'self'; base-uri 'self'; form-action 'self'