The problem mentioned in https://www.drupal.org/project/field_group/issues/2318311 → is still occurring in 7.x-1.6. The patch https://www.drupal.org/project/field_group/issues/2318311#comment-12545945 → fixes it and I think should be added to the module as I have tested it and works great.
Creating this new ticket since the original one is closed.
Closed: won't fix
1.6
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.