Error when target is an array of connections

Attaching test results

- Drupal version: 11.0.4
- PHP version: 8.3.11

Prior to including the mysql57 settings.inc file, you can see that the "replica" database is an array of connections:

Defined in the settings.php file as such- per guidance from d.o:
- https://www.drupal.org/docs/drupal-apis/database-api/database-configuration →

$databases['default']['default'] = [
  'driver' => 'mysql',
  'database' => 'drupaldb1',
  'username' => 'username',
  'password' => 'secret',
  'host' => 'dbserver1',
];
$databases['default']['replica'][] = [
  'driver' => 'mysql',
  'database' => 'drupaldb2',
  'username' => 'username',
  'password' => 'secret',
  'host' => 'dbserver2',
];
$databases['default']['replica'][] = [
  'driver' => 'mysql',
  'database' => 'drupaldb3',
  'username' => 'username',
  'password' => 'secret',
  'host' => 'dbserver3',
];

After conversion (with patch) - you can see that the databases defined in the "replica" target have updated successfully, and there are no db connection errors:

This is great. Thank you! Merged to 1.0.x.

scott_earnest → closed merge request !3

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