If you call TXLSWorksheet.FreezePanes with two 0 arguments, then created XLSX cannot be read in Microsoft Office 2016 Professional Plus VL September 2018, v.16.0.4738.1000.
I haven't investigated sources yet, but I think that TXLSWorksheet.FreezePanes should ignore two 0 arguments. Or description of TXLSWorksheet.FreezePanes should include information about special case of two 0 arguments.