I have added a catalog to the WhatsApp Business Number and also enabled it by setting is_catalog_visible to true in the whatsapp_commerce_settings endpoint. It was displaying on the WhatsApp App to customers a few days ago, but now it's no longer available.

The whatsapp_commerce_settings endpoint returns this:-

{
    "data": [
        {
            "is_cart_enabled": true,
            "is_catalog_visible": true,
            "id": "4528440XXXXXXXX"
        }
    ]
}

The products in the Catalog also have no issues or errors and their status is "green" for WhatsApp. I am starting to feel this is a Bug in the system.