Strange behavior for public forums
I’m seeing issues that seem to only affect public forums (private or hidden work as expected). Public forums don’t appear in the admin ‘All’ list view, although they do appear under ‘Published’. Attempting to view the single page for a public forum gives a 404 when logged in. When not logged in, it gives the following fatal error:
Fatal error: Uncaught Error:  operator not supported for strings in .../plugins/bbpress/includes/forums/functions.php on line 1855Looking at that line, the get method of WP_Query returns an empty string if no matching key is found. That explains the  operator error and adding a default empty array to the call does fix the issue for non logged in users. However, the root cause must be higher up the call chain because it doesn’t fix the permalink problem.
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