If I have a wiki page containing NOTOC, Parsoid outputs:

<meta property="mw:PageProp/notoc" data-parsoid='{"src":"NOTOC","magicSrc":"NOTOC","dsr":[966,975,null,null]}'>

When VE edits this and changes the property attribute from notoc to forcetoc, we end up serializing:

<meta property="mw:PageProp/forcetoc" data-parsoid='{"src":"NOTOC","magicSrc":"NOTOC","dsr":[966,975,null,null]}'>

Which should serialize to FORCETOC, but instead the data-parsoid wins and this serializes to NOTOC.

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