Simple way to reproduce:
-create new spreadsheet document
-group columns B,C,D (F12)
-save as xlsx document
-reopen document : grouping is lost
(Happens too with data in the spreadsheet, no data gets lost.)
Reproduced with versions 18.104.22.168, 22.214.171.124, 126.96.36.199.alpha0plus on Windows7 and on Linux.
duplicate of bug 64613?
(In reply to raal from comment #1)
> Hi Winfried,
> duplicate of bug 64613?
Yes, you're right. I looked for duplicates, but didn't find them.
*** This bug has been marked as a duplicate of bug 64613 ***