The calls work fine when omitting the fields parameter.
I don’t have the call ID’s as this would only happen periodically and I could not get it to reliably reproduce when making the call and investigating the request-id. I could even make calls for the same order id and get a success, however removing the fields parameter stopped this from happening at all.
Ideally I can keep the fields parameter because it is more efficient to only request what is needed, but had to remove it due to this error.