BaseFieldOverride breaks the base field

Problem/Motivation

The base field is missing many properties after overriding the base field.

Steps to reproduce

for example with machine_name field

public static function baseFieldDefinitions(EntityTypeInterface $entity_type): array {
...

    $fields['code'] = BaseFieldDefinition::create('string')
      ->setLabel(new TranslatableMarkup('Old label'))
      ->setSetting('max_length', 128)
      ->setRequired(TRUE)
      ->addConstraint('UniqueField', [])
      ->addPropertyConstraints('value', ['Regex' => ['pattern' => '/^[a-z0-9_]+$/']])
      ->setDisplayOptions('form', [
        'type' => 'machine_name',
        'settings' => [
          'weight' => 100,
          'source_field' => 'label',
          'disable_on_edit' => TRUE,
          'standalone' => TRUE,
        ],
      ])
      ->setDisplayConfigurable('view', TRUE);
}

// The field is on box entity yellow bundle.
$fields = Drupal::service('entity_field.manager')->getFieldDefinitions('box', 'yellow');

$code_field = $fields['code'];

// Get field config for given bundle, before using base field override.
kint($code_field->getConfig('yellow'));

// Change field label.
$code_field->getConfig('yellow')->setLabel('New label')->save();

// Get field config after field override.
kint($code_field->getConfig('yellow'));

comparing the field config before and after the override, the field is missing the following properties: constraints, display, provider.

Proposed resolution

The base field override should only override properties which are defined by the override.