While it may be a bug within angular, it is not unusual to have save/exit silently fail. There are any number of reasons why this can happen from a holding template failing to having an empty input well for a call number or an item, to a duplicate barcode entered. Since the holdings editor closes, you have to start all over and hope you don't make the same mistake again.
Mike,
Welcome to our world....
While it may be a bug within angular, it is not unusual to have save/exit silently fail. There are any number of reasons why this can happen from a holding template failing to having an empty input well for a call number or an item, to a duplicate barcode entered. Since the holdings editor closes, you have to start all over and hope you don't make the same mistake again.