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Try to adapt this:
add_filter( 'nav_menu_css_class', 'namespace_menu_classes', 10, 2 );
function namespace_menu_classes( $classes , $item ){
if ( in_array(get_post_type(), array('forum','topic','reply')) )
{
$classes = str_replace( 'current_page_parent', '', $classes );
$classes = str_replace( 'menu-item-22902', 'current-page-parent', $classes );
}
return $classes;
}