Country field is set to none for the existing nodes even though the address field is set to default country

We ran into this as well, and it was a case of case-sensitivity in the data. We had "us" in the database instead of "US".

We fixed it in an update hook:

  $database = \Drupal::database();
  $tables = ['node__field_address', 'node_revision__field_address'];
  foreach ($tables as $table) {
    $query = $database->select($table, 'nfa')
      ->where('binary field_address_country_code = :code',
        ['code' => "us"])
      ->fields('nfa', ['entity_id'])
      ->execute();
    $result = $query->fetchCol();
    foreach ($result as $id) {
      $query = $database->update($table);
      $query->fields(['field_address_country_code' => 'US']);
      $query->condition('entity_id', $id);
      $query->execute();
    }
  }

Find your address field and run a query like this one to check:

select entity_id, field_address_country_code FROM node__field_address where field_address_country_code= BINARY 'us';

At the module level, it might be nice to UPPERCASE country codes in all lookups.

I would prefer to let the sites be responsible for the validity of their data, because silently returning lowercase country codes could break other modules, REST clients, etc.

Automatically closed - issue fixed for 2 weeks with no activity.