Created attachment 203846 [details]
The example file saved in master as XLSX

This is a followup to bug 169363

When the example file attachment 203844 [details] is saved as XLSX and reopened in Excel, all columns with merged cells show the autofilter dropdown, instead of just the rightmost.

1. Open attachment 203844 [details]
2. Save as XLSX
3. Reopen the file in Excel (in Calc, this issue is not visible, interestingly...)
-> The cells I1:K1 are merged and have autofilter dropdowns shown instead of just K1 having it

Version: 26.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 620(Build:0)
CPU threads: 16; OS: Windows 10 X86_64 (build 19045); UI render: Skia/Raster; VCL: win
Locale: de-DE (hu_HU); UI: en-US
Calc: threaded

This seems to have been happening ever since 3.3.