Domain Group is not editable?

[yurg]

Hi, having an issue with multi-lingual multi-domain website on /wp-admin/admin.php?page=civicrm_au_multidomain page, which is: Domain Group drop-down returns no results but the default Group (ID1), therefore it's a bit impossible to change the group. For what it's worth each domain record in /wp-content/uploads/civicrm/civicrm.domains.php contains different group ID ( see below ) which doesn't seem to be making any difference on the /wp-admin/admin.php?page=civicrm_au_multidomain domain page(-s)
I wonder, would it be something

Main domain
'domain_id' => 1,
'domain_group_id' => 7,
'domain_org_id' => 1,

Second Domain
'domain_id' => 21,
'domain_group_id' => 11,
'domain_org_id' => 1,

Wordpress 6.3, CiviCRM Admin Utilities Version 0.9.3, CiviCRM 5.61.2

Thanks.