i have an error using the Storefront API in the version unstable. When i try of get the nex page of 'lines' with the property 'after' (send a cursor) i have the error " Malformed cursor", also with the mutation 'cartLinesUpdate' for add quantity i get this error 'ExceptionsManager.js:179 Error: Internal error. Looks like something went wrong on our end. Request ID: 4846026d-de00-43cc-9403-ff0e5e968501 (include this in support requests).' i know that is a premature version. thanks and i am sorry for my bad english!