Product detail, button "Service Details Overview" doesn't render service details

[AchillesNK]

Hello

I created privisiong module and add custom buttons => functions

function myCutomModule_ClientAreaCustomButtonArray()
{
    global $_LANG;

    return [
        $_LANG['myCutomModule']['create_meeting'] => "create",
        $_LANG['myCutomModule']['create_list'] => "list",
        $_LANG['myCutomModule']['create_history'] => "history",
    ];
}

function myCutomModule_create($params)
{
    return [  'templatefile' => '/templates/create',  'vars' => [],]
}

function myCutomModule_list($params)
{
    return [  'templatefile' => '/templates/list',  'vars' => [],]
}

function myCutomModule_history($params)
{
  return [
    'templatefile' => '/templates/history',
    'vars' => [
    ],
  ];
}

Problem: I can't open Service Details Overview from the my custom page.

Url before I clicked the tab Information: https://local.domain.net/clientarea.php?action=productdetails&id=19&modop=custom&a=create&language=english
Url after click: https://local.domain.net/clientarea.php?action=productdetails&id=19&modop=custom&a=create&language=english#tabOverview