How to set offline payment method new order status to pending

I’ve created a new offline payment module:

config.xml

<order_status>pending</order_status>

system.xml

    <field id="order_status" translate="label" type="select" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="0">
    <label>New Order Status</label><source_model>PackageName\ModuleName\Model\Config\Source\Order\Status\Pendingpayment</source_model>
 </field>

I’want to set new order status to pending or pending_payment, but it set to processing when creating a order every time.

Hello,

maybe the config.xml must be:

....
 <order_status>pending_payment</order_status>
...

regards