Having an issue when Deserializing a webhook into a GraphQL Order.

I used the Webhooks service to create the webhook, as outlined in the AuntieDot project. Works fine when using the standard ShopifySharp.Order, however deserializing to the ShopifySharp.GraphQL.Order causes and error regarding using collection types (pic below).

Any thoughts? Shopify still recommends using their Webhooks for realtime updates, and the Payloads on their docs match the ShopifySharp.GraphQL objects.