LibreOffice Calc version 18.104.22.168 running on Linux Mint Xfce 18.3
Calc imported a series of XLSX, saved each as ODS, closed and re-opened the ODS.
Edit Links > Modify each XLSX reference to that of the equivalent ODS file.
But, in the workbook, references to the XLSX remained. It required a find-and-replace exercise to manually replace “.XLSX” with “.ODS”.
Is this by design?