https://bugs.documentfoundation.org/show_bug.cgi?id=149034

            Bug ID: 149034
           Summary: FILESAVE XLSX Saved trivial file opens with
                    "Catastrophic failure" in older Excel
           Product: LibreOffice
           Version: 7.4.0.0 alpha0+ Master
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: bibisected, bisected, dataLoss, regression
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
            Blocks: 104839

Created attachment 180057
  --> https://bugs.documentfoundation.org/attachment.cgi?id=180057&action=edit
Trivial example file from Calc

Attached trivial file when saved with recent master to xlsx, opens with a
repair dialog in Excel 2010 and 2013. 

1, Open attached file, it contains only a "Hello world" in A1.
2, Save as xlsx
3, Open the xlsx in Excel 2010 or 2013

Excel finds unreadable content with the message:
Repaired Part: /xl/worksheets/sheet1.xml part with XML error.  Catastrophic
failure Line 2, column 0.

With a more complex file this led to loss of drawing shapes and charts.

Version: 7.4.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: cdf8e971d5d46df4bcab35a99c4254df9459213f
CPU threads: 14; OS: Windows 10.0 Build 19044; UI render: default; VCL: win
Locale: de-DE (hu_HU); UI: en-US
Calc: threaded

Not yet in 7.3.3
Bibisected to: 
https://git.libreoffice.org/core/+/a2bcac670ef0254d8b2e8632cfe07bb855b28d1c

author  Tomaž Vajngerl <[email protected]> Fri Apr 01 17:06:18
2022 +0900
committer       Tomaž Vajngerl <[email protected]>       Tue Apr 05 13:43:17
2022 +0200

sc: improve SparklineList to track added SparklineGroups

Adding CC to: Tomaž Vajngerl


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=104839
[Bug 104839] [META] Saved XLSX files that MS Excel can't open
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