On plaid-python 8.0.0b with API version 2020-09-14, calling item get blew up during response deserialization with __init__() missing 1 required positional argument: 'request_id'. The field went from nullable in API 2019-05-29 to non-nullable in 2020-09-14, but the API wasn't including it in item-get responses — specifically the Error attribute deserialization failed when items were in an error state. The reporter had no workaround.