I have installed version 1.1.7 of WCMp Vendor Staff and I noticed that the default email templates of WooCommerce are not displayed anymore in WooCommerce Email Settings page.
I have tried to check and it seems that the Vendor Staff plugin cleared the WooCommerce email template when it added its own email template
Kindly check below function inside class-wcmp-sub-vendor.php
// Email template added
function wcmp_sub_vendor_email_setup() {
require_once( 'emails/class-sub-vendor-email.php' );
$emails['WCMP_Sub_Vendor_Email'] = new WCMP_Sub_Vendor_Email();
return $emails;
}