This is a repeat, because the first time I was not allowed to upload a file.
I recently upgraded to 4.3 and used a spreadsheet like I always have for the past decade. Only now Calc is mangling the structure. When I finally figured out what was going one, I had lost days of work. I can’t upload the original but here is a simplified example.
In Lo 4.2 and Excel, changing the rank sort, preserves the structure of the spreadsheet. Doing it in LO 4.3 scrambles everything. In larger spreadsheets the consequences are much more severe.