Duplicate #25998 ?

Which Kind of code should I add? It is a functionally problem and not a bug in any code.
And which further information is required?

I you show the taghelper object there is no key in the array where a connection to another language is saved.

object(Joomla\CMS\Helper\TagsHelper)#708 (4) {
  ["tagsChanged":protected]=>
  bool(false)
  ["replaceTags":protected]=>
  bool(false)
  ["typeAlias"]=>
  NULL
  ["itemTags"]=>
  array(1) {
    [0]=>
    object(stdClass)#717 (31) {
      ["tag_id"]=>
      string(2) "54"
      ["id"]=>
      string(2) "54"
      ["parent_id"]=>
      string(2) "40"
      ["lft"]=>
      string(2) "92"
      ["rgt"]=>
      string(2) "93"
      ["level"]=>
      string(1) "2"
      ["path"]=>
      string(41) "blog-schlagwoerter/mobilitaet-mietmodelle"
      ["title"]=>
      string(24) "Mobilität - Mietmodelle"
      ["alias"]=>
      string(22) "mobilitaet-mietmodelle"
      ["note"]=>
      string(0) ""
      ["description"]=>
      string(0) ""
      ["published"]=>
      string(1) "1"
      ["checked_out"]=>
      string(1) "0"
      ["checked_out_time"]=>
      string(19) "0000-00-00 00:00:00"
      ["access"]=>
      string(1) "1"
      ["params"]=>
      string(53) "{"tag_layout":"","tag_link_class":"label label-info"}"
      ["metadesc"]=>
      string(0) ""
      ["metakey"]=>
      string(0) ""
      ["metadata"]=>
      string(25) "{"author":"","robots":""}"
      ["created_user_id"]=>
      string(3) "875"
      ["created_time"]=>
      string(19) "2018-05-16 15:08:48"
      ["created_by_alias"]=>
      string(0) ""
      ["modified_user_id"]=>
      string(3) "875"
      ["modified_time"]=>
      string(19) "2018-09-11 09:19:07"
      ["images"]=>
      string(197) "{"image_intro":"","float_intro":"","image_intro_alt":"","image_intro_caption":"","image_fulltext":"images\/logo.png","float_fulltext":"","image_fulltext_alt":"","image_fulltext_caption":""}"
      ["urls"]=>
      string(2) "{}"
      ["hits"]=>
      string(2) "66"
      ["language"]=>
      string(1) "*"
      ["version"]=>
      string(1) "1"
      ["publish_up"]=>
      string(19) "2018-05-16 15:08:48"
      ["publish_down"]=>
      string(19) "2018-05-16 15:08:48"
    }
  }
}

Is your issue duplicate/related to #25998 or #21326?