This item has been identified as an outstanding known issue.
Following the Maintenance window Saturday, July 25, 2020 from 1:00 p.m. to 5:00 p.m. PDT. Some models may fail to open intermittently, potentially with the error:
"End date for a date time entity is not supported"
If this occurs, please attempt to open the model again, and contact Support at firstname.lastname@example.org.