Commented Unassigned: Pivot Table based on a Named Range [15421]

There is an issue with saving a workbook which contains a Pivot Table based on a Named Range.
Please find attached three workbooks which suffer from this issue. To replicate the issue, just open one of these workbooks with EPPlus and save.

EPPlus throws "Object reference not set to an instance of an object" in line 3191, ExcelWorksheet.cs, because variable "ws" is set to null.
Comments: This issue is already in an item, the 15266. I have tryed the 2 solutions but kepp having compilation errors... I hope this issue will be corrected sooner.