Problem parsing unattend answer file (Missing time zone)

I've received an error with using a custom unattend.xml file when testing a Windows 10 image.  After checking the setupact file, at the bottom I see the error "[Shell Unattend] TimeZone: Time zone data missing ' ' (0x80070002)", in the "specialize" section.

In my attend file, I have the time zone set to "020" (which should indicate the US central time zone) in the "Specialize" section.  Does anyone know what might cause an error like this?