Required field "type_ignores" missing from Module

I have (in the past two days) began receiving a ‘required field “type_ignores” missing from Module’ error message when attempting to load my notebook. This does not happen to my local notebook configurations, and did not happen until recently on Binder. Online research suggests this has happened with prior Python versions. Is it possible to set an earlier Python version to test this? How can one debug this kind of error?