Javascript states not working for boolean fields

Steps to reproduce:

1. Add a field of type "Boolean" to any entity type and bundle.
2. Edit the display settings of that field.
3. The two text fields for custom labels stay visible no matter what you select for "Output format".

This is caused by the following in \Drupal\Core\Field\Plugin\Field\FieldFormatter\BooleanFormatter::settingsForm(), which (I'm pretty sure) incorrectly hard-codes field_boolean as the field name:

    $form['format'] = [
      '#type' => 'select',
      '#title' => $this->t('Output format'),
      '#default_value' => $this->getSetting('format'),
      '#options' => $formats,
    ];
    $form['format_custom_true'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Custom output for TRUE'),
      '#default_value' => $this->getSetting('format_custom_true'),
      '#states' => [
        'visible' => [
          'select[name="fields[field_boolean][settings_edit_form][settings][format]"]' => ['value' => 'custom'],
        ],
      ],
    ];
    $form['format_custom_false'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Custom output for FALSE'),
      '#default_value' => $this->getSetting('format_custom_false'),
      '#states' => [
        'visible' => [
          'select[name="fields[field_boolean][settings_edit_form][settings][format]"]' => ['value' => 'custom'],
        ],
      ],
    ];