It looks like there is not a final response to this topic. I have exactly the same problem (I can preview form, answer the form, but cannot edit it).
I think my cascading is well set up (in the XLS form) but I keep having the error message " *Error loading survey: cascading choices can only reference one choice list" when I try to edit the form in the form builder UI.
When I check my form here ODK - XLSForm Online v2.x it works well.
Can anyone help ?
MAMII_baseline_SN 01-04-2021.xls (319 KB)