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Google have removed the properties below from their recommended list, stating that they are "unused by Google Search" and that the Rich Result Test doesn't flag warnings for them.
Google added a new content guideline to the documentation for QAPage, relating specifically to pages about STEM education Q&As. Pages where the primary focus is to provide a correct answer to a user-submitted homework question may be eligible for a Q&A carousel experience. These pages may only have a single answer that's provided or selected by in-house experts (instead of users).
The docs also include an example: "An education page where a user submitted a single question, and a top answer is selected by experts."