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Form API placeholder attribute rendered as "- Select -"

In a custom Drupal 8 module, I have a couple of Form API fields of '#type' => 'select':

    $form['form-right']['field_role'] = [       '#type' => 'select',       '#title' => $this->t('Role'),       '#title_display' => 'invisible',       '#required' => TRUE,       '#options' => [         'foo' => $this->t('Role Foo'),         'bar' => $this->t('Role Bar'),         'baz' => $this->t('Role Baz'),         'quux' => $this->t('Role Quux'),         'plugh' => $this->t('Role Plugh'),         'xyzzy' => $this->t('Role Xyzzy'),       ],       '#attributes' => [         'placeholder' => $this->t('Role'),       ],     ];      $form['form-right']['field_contact_reason'] = [       '#type' => 'select',       '#title' => $this->t('Contact Reason'),       '#title_display' => 'invisible',       '#required' => TRUE,       '#options' => [         'foo' => $this->t('Contact Reason Foo'),         'bar' => $this->t('Contact Reason Bar'),         'baz' => $this->t('Contact Reason Baz'),         'other' => $this->t('Other'),       ],       '#attributes' => [         'placeholder' => $this->t('Contact Reason'),       ],     ];

Before a value is selected, the dropdown select picklists display the string '- Select -':

Form API placeholder attribute rendered as "- Select -"

The client would like them to display the value in the placeholder attribute instead.

Have I done something wrong?

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Form API placeholder attribute rendered as "- Select -"

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