https://bugs.winehq.org/show_bug.cgi?id=37339
--- Comment #1 from Rosanne DiMesio dimesio@earthlink.net --- I tried to reproduce this in 1.7.27, and can't; I added a simple pivot table to a spreadsheet, saved it, and had no problem reopening it.
Please retest in 1.7.27 or later. If you still have the problem, please attach a sample, non-confidential xlsx file that demonstrates it.