Remove Hidden Field Requirement for Marketo Forms API When Writing to Program Member Custom Fields

Today, if you attempt to use the addHiddenFields form method with Marketo's JavaScript Forms API when attempting to write into a Program Member field, the platform requires that you have at least one program member field populated on the form itself inside Marketo. For example, if I have PMCF fields 1-10, you must have at least "PMCF Field 1" hidden on the form directly for PMCF Fields 1-10 to record.

This requirement is not in place for standard Marketo fields; could we please get the ability to directly write into PMCF fields without this additional step? This becomes problematic when needing to adjust forms at scale.