bbp_buffer_template_part( string $slug, string $name = null,  $echo = true )

function bbp_buffer_template_part( $slug, $name = null, $echo = true ) {
	ob_start();

	bbp_get_template_part( $slug, $name );

	// Get the output buffer contents
	$output = ob_get_clean();

	// Echo or return the output buffer contents
	if ( true === $echo ) {
		echo $output;
	} else {
		return $output;
	}
}