The initial D8 port will not support migrations from D7. This is a significant piece of work, so we are focusing on initially releasing a version for D8 that will work for only new sites. Once this is stable, we can consider migrations.
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Closed: won't fix
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
All feature request against 7.x would be closed. The focus is now on Drupal 10 release. If you feel this issue is relevant for Drupal 10 version of the project, please feel free to re-open and update the issue. Thanks for the discussion/contribution.
You may follow 📌 Port PM to Drupal 10 Active to know more about Drupal 10 status.