Either go to a title package that has multiple custom coverage dates or attempt to add multiple custom coverage dates from full page edit

For example, the below has multiple dates:
https://folio.frontside.io/eholdings/resources/554-3943-1004264

You will see an error screen such as below. It doesn't appear that full page edit is working for multiple coverage dates. Confirmed this error did not get introduced with latest changes as part of uieh-365`