function bbp_pre_get_posts_normalize_forum_visibility( $posts_query = null ) {

	// Bail if all forums are explicitly allowed
	if ( true === apply_filters( 'bbp_include_all_forums', false, $posts_query ) ) {
		return;
	}

	// Bail if $posts_query is not an object or of incorrect class
	if ( ! is_object( $posts_query ) || ! is_a( $posts_query, 'WP_Query' ) ) {
		return;
	}

	// Get query post types array .
	$post_types = (array) $posts_query->get( 'post_type' );

	// Forums
	if ( bbp_get_forum_post_type() === implode( '', $post_types ) ) {

		// Prevent accidental wp-admin post_row override
		if ( is_admin() && isset( $_REQUEST['post_status'] ) ) {
			return;
		}

		/** Default ***********************************************************/

		// Add all supported forum visibilities
		$posts_query->set( 'post_status', array_keys( bbp_get_forum_visibilities() ) );

		// Get forums to exclude
		$hidden_ids = bbp_exclude_forum_ids( 'array' );

		// Bail if no forums to exclude
		if ( empty( $hidden_ids ) ) {
			return;
		}

		// Get any existing meta queries
		$not_in = $posts_query->get( 'post__not_in', array() );

		// Add our meta query to existing
		$not_in = array_unique( array_merge( $not_in, $hidden_ids ) );

		// Set the meta_query var
		$posts_query->set( 'post__not_in', $not_in );

	// Some other post type besides Forums, Topics, or Replies
	} elseif ( ! array_diff( $post_types, bbp_get_post_types() ) ) {

		// Get forums to exclude
		$forum_ids = bbp_exclude_forum_ids( 'meta_query' );

		// Bail if no forums to exclude
		if ( empty( $forum_ids ) ) {
			return;
		}

		// Get any existing meta queries
		$meta_query   = (array) $posts_query->get( 'meta_query', array() );

		// Add our meta query to existing
		$meta_query[] = $forum_ids;

		// Set the meta_query var
		$posts_query->set( 'meta_query', $meta_query );
	}
}