Try to add a count bubble next to a custom group tab added via BP_Group_Extension

BuddyPress > Nouveau > Add Count to Group Tab

// Using the Nouveau template pack

// Add a count bubble on a custom tab on a user profile is straightforward 

		$count  = get_the_count_profile( $group_id );

		$class  = ( 0 === $count ) ? 'no-count' : 'count';

		$name = sprintf( __( 'Events <span class="%s">%s</span>', 'bp-simple-events' ), esc_attr( $class ), number_format_i18n( $count ) );
      
		bp_core_new_nav_item( array(
			'name'                => $name,
			'slug'                => 'events',
			'position'            => $tab_position,
			'screen_function'     => 'pp_events_profile',
			'default_subnav_slug' => $default_subnav_slug,
			'item_css_id'         => 'member-events'
		) );
    
    
    
// but afaik adding the count for a group tab added via BP_Group_Extension does not work in Nouveau ( it DOES work in Legacy pack ) 

		$count  = get_the_count_group();

		$class  = ( 0 === $count ) ? 'no-count' : 'count';

		$name = sprintf( __( 'Events <span class="%s">%s</span>', 'bp-simple-events' ), esc_attr( $class ), number_format_i18n( $count ) );

		$args = array(
     			'name'              => $name,
			'slug'              => 'group-events',
		  	'nav_item_position' => 200.5,
      			'show_tab'          => $show_tab,
      			'screens' 	    => $screens
     		);

		parent::init( $args );