Hello @KStein,
This is a defect (BUG-000137465) that's caused by a geometry question in the XLSForm that has null set in the bind::esri:fieldType. This is present in pre 10.9.0 ArcGIS Enterprise organizations.
Please feel free to reach out to Esri Technical Support to attach yourself to the defect and track it's status.
Thank you,
Zach