"Is Known Error" check box has been removed in Service Manager 9.50

In the earlier Process Designer Content Pack for version 9.3x the Problem Forms had a field labeled something like Known Error. This field is not present on the OoB formats in version 9.50, but the isKnownError field is still present in the rootcause dbdict.

I would like to know what was the purpose and functionality behind this field, and why has it been removed from the formats.

Is the funtionallity still in place in version 9.50 and could I put the field back on the formats?

Kind regards
Erik Birch Andersen