Answers 7.x-3.x uses 'answer' and 'question' for the node types. Answers 7.x-4.x uses 'answers_answer', and 'answers_question' for the node types.
The nodes and fields needs to be converted in order for users to upgrade.
Closed: outdated
4.0
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It's likely this issue predates Contrib.social: some issue and comment data are missing.