Select advanced search

Hello,

In a front-end form I have this field:

        [
    'name'          => __( 'Country focus', 'your-text-domain' ),
    'id'            => $prefix . 'academiccountry_focus',
    'type'          => 'taxonomy',
    'taxonomy'      => ['country-tags'],
    'field_type'    => 'select_advanced',
    'multiple'      => true,
    'query_args'    => [
      //  'orderby'  => 'menu_order',
      //  'order'    => 'ASC',
        'child_of' => 10152,
        'exclude'  => 12950,
    ],
    'admin_columns' => [
        'position'   => 'after title',
        'title'      => 'Country',
      //  'sort'       => true,
      //  'searchable' => true,
      //  'filterable' => true,
    ],
    'columns'       => 12,
    'class'         => 'rs_p5',
    'tab'           => 'page_5',
   //    'js_options' => [
    //   'allowClear' => true,
//   ],
],

I am having the issue that if you search for a term that is not in the initial loaded list, then it returns as no result. The term Im searching for is there, as when I load-scroll down-load I can find it