Description
When attempting a payment with the Mollie gateway we encounter the following issue:

If we attempt the payment through the admin panel, we have the same issue.
Steps to reproduce
- Add products to cart and fill in the necessary data
- Attempt to start a payment with the Mollie gateway
- Receive an error: "Item should be an instance of Omnipay\Mollie\Item"
Additional info
- Craft version: Craft Pro 5.8.17
- PHP version: 8.3.25
- Database driver & version: PostgreSQL 17.4
- Plugins & versions:
- Craft Commerce: 5.4.6
- Mollie for Craft Commerce: 4.4.0