Checkout’s Phone field disappears (Mollie Payments)

When visiting the checkout, the phone field is disappearing. This complicates the checkout process when the phone field is marked as Required because being hidden is uneditable and will fail when finalising the checkout.

There is an ongoing discussion on Mollie’s official repository.

Solutions (one of these):

• Downgrade to Mollie Payments 7.3.7 (official download link)
• Use the Classic Checkout layout (either change it in the Checkout widget ex: https://d.pr/i/4muOPg or just use the [woocommerce_checkout] shortcode);