FieldEmbedView::getViewsArgumentsValues() initializes twice $reference_key and initializes $display_field_name, which never uses

FieldEmbedView::getViewsArgumentsValues() contains the following code.

    $reference_key = $display_settings['reference_key'];
    $field_name = $display_settings['field_name'];
    $reference_key = $display_settings['reference_key'] ?? $field_name;
    $display_field_name = $display_field['field_name'];

$reference_key is initialized twice, and $display_field_name is initialized once, but never used.