Hans
I think that, if you go into the Advanced Editor you may have the line that attempts to apply a data type to the heading by its former name.
Removing that applied step might sort the problem.
I usually fake the headings above the Table in Excel and show the actual table without the header row showing. The structured references are not much use then, but one can still access columns by using XLOOKUP on the dummy header row to return values from the table body.