If anyone has any idea how to get in contact, I'd appreciate a pointer. There isn't any contact info that I could find on the MSDN page, and there isn't a github repo around that I can drop an issue into. My email is in my profile as well.
[0] https://www.nuget.org/packages/Microsoft.InformationProtection.File, https://learn.microsoft.com/en-us/information-protection/develop/
[1] https://stackoverflow.com/a/75855054