Closing this issue as not reproducible. Unclosed multipatches are not classified as invalid geometries; however, they can adversely affect downstream 3D analysis workflows. The sample dataset provided was intentionally constructed to produce unclosed multipatches in a manner that is technically valid. This is not the result of an error in the data ingestion or processing pipeline, but rather an artifact of the dataset’s original construction. Attempts to reproduce the behavior by creating similar data using Autodesk tools were unsuccessful, suggesting that this problem may be unique to a specific workflow.