Check the project and the attached video
When opening a xlsx file in a form with a spreadsheet and a ribbon an error occurs.
If a ribbon doesn't exist the error desn't occur.
For example in Catalog2 the error occurs if you press the button. If you delete the ribbon and try again the error doesn't occur.
If I save the xlsx fie to which the error occurs as xls it is opened in the sample project with no problem
If the ribbon is created in previoyus versions I don't think that the error occus, because I have a form in my app with a ribbon already created
to which the error doesn't exist.
This error occurs both to 19.1.6 and 19.2.2 version