BuddyPress.org

I am branching pages in this code:

// BuddyPress
$arr = explode( '/', $_SERVER['REQUEST_URI'] );
if ( isset($arr[1]) && $arr[1] === 'members' ) :

	// Pages that only the himself can access
	if( $arr[3] === 'messages' || $arr[3] === 'settings' || $arr[3] === 'notifications' ) :
		get_template_part( 'template-parts/page', 'bp-only' );
	
	// Pages that other users can access
	else :
		get_template_part( 'template-parts/page', 'bp-public' );
	
	endif;

endif;	

However, on the above code, $wp_query does not work in “page-bp-public.php”.
For example, I use $wp_query as below to output topic list, but topic title is not output.

function my_pre_get_posts( $query ) {
	$query->set('post_type', 'topic');
}
add_action('pre_get_posts','my_pre_get_posts');

<?php global $wp_query; ?>
<?php if ($wp_query->have_posts()): ?>
<?php while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
	<?php echo get_the_title(); ?>
<?php endwhile; ?>
<?php else: ?>
	<p>nothing</p>
<?php endif; ?>

How can I use $wp_query on “page-bp-public.php”?

・・・

By the way, I var_dump to $wp_query and it will be as follows:

<pre><?php var_dump($wp_query->query_vars);?></pre>

<pre>array(65) {
  ["page"]=>
  int(0)
  ["pagename"]=>
  string(6) "forums"
  ["error"]=>
  string(0) ""
  ["m"]=>
  string(0) ""
  ["p"]=>
  int(0)
  ["post_parent"]=>
  string(0) ""
  ["subpost"]=>
  string(0) ""
  ["subpost_id"]=>
  string(0) ""
  ["attachment"]=>
  string(0) ""
  ["attachment_id"]=>
  int(0)
  ["name"]=>
  string(6) "forums"
  ["static"]=>
  string(0) ""
  ["page_id"]=>
  int(0)
  ["second"]=>
  string(0) ""
  ["minute"]=>
  string(0) ""
  ["hour"]=>
  string(0) ""
  ["day"]=>
  int(0)
  ["monthnum"]=>
  int(0)
  ["year"]=>
  int(0)
  ["w"]=>
  int(0)
  ["category_name"]=>
  string(0) ""
  ["tag"]=>
  string(0) ""
  ["cat"]=>
  string(0) ""
  ["tag_id"]=>
  string(0) ""
  ["author"]=>
  string(0) ""
  ["author_name"]=>
  string(0) ""
  ["feed"]=>
  string(0) ""
  ["tb"]=>
  string(0) ""
  ["paged"]=>
  int(0)
  ["meta_key"]=>
  string(0) ""
  ["meta_value"]=>
  string(0) ""
  ["preview"]=>
  string(0) ""
  ["s"]=>
  string(0) ""
  ["sentence"]=>
  string(0) ""
  ["title"]=>
  string(0) ""
  ["fields"]=>
  string(0) ""
  ["menu_order"]=>
  string(0) ""
  ["embed"]=>
  string(0) ""
  ["category__in"]=>
  array(0) {
  }
  ["category__not_in"]=>
  array(0) {
  }
  ["category__and"]=>
  array(0) {
  }
  ["post__in"]=>
  array(0) {
  }
  ["post__not_in"]=>
  array(0) {
  }
  ["post_name__in"]=>
  array(0) {
  }
  ["tag__in"]=>
  array(0) {
  }
  ["tag__not_in"]=>
  array(0) {
  }
  ["tag__and"]=>
  array(0) {
  }
  ["tag_slug__in"]=>
  array(0) {
  }
  ["tag_slug__and"]=>
  array(0) {
  }
  ["post_parent__in"]=>
  array(0) {
  }
  ["post_parent__not_in"]=>
  array(0) {
  }
  ["author__in"]=>
  array(0) {
  }
  ["author__not_in"]=>
  array(0) {
  }
  ["ignore_sticky_posts"]=>
  bool(false)
  ["suppress_filters"]=>
  bool(false)
  ["cache_results"]=>
  bool(true)
  ["update_post_term_cache"]=>
  bool(true)
  ["lazy_load_term_meta"]=>
  bool(true)
  ["update_post_meta_cache"]=>
  bool(true)
  ["post_type"]=>
  string(0) ""
  ["posts_per_page"]=>
  int(1)
  ["nopaging"]=>
  bool(false)
  ["comments_per_page"]=>
  string(2) "50"
  ["no_found_rows"]=>
  bool(false)
  ["order"]=>
  string(4) "DESC"
}
</pre>