Fee no longer appears on the tax invoice, but it does on Proforma

We are using the plugin ‘Payment Gateway Based Fees and Discounts for WooCommerce’ to add a bank fee. Since we upgraded to the latest Woocommerce version we no longer see the Fee on the PDF Tax Invoice, but we do see it on the Proforma Invoice document; however, these may have been generated before the upgrade. I have tried updating to the latest PDF Invoices & Packing Slips for WooCommerce plugin and I have tried removing the ‘Fees’ row and re-adding it via the Customizer, but neither actions help it appear on the invoice.