Looking at the code around line 600 in forum_access.module, it seems that the only way to have a user moderate posts in a forum topic is either if it's their own content, or if they've been manually added as moderators for that forum topic. But there's no way to make a user automatically be able to moderate anything in absolutely any forum topic (including newly created ones).
Would be great to have a permission "administer all forum topics" that would simply allow that!
Closed: outdated
1.0
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It's likely this issue predates Contrib.social: some issue and comment data are missing.