Created attachment 203181 [details]
Example file from Excel

Attached example file has a custom number formatting applied on data used by a pivot table.
The pivot table also uses this custom number format, but when the file is opened in Calc, it resets to standard number format.

1. Open attached file
-> in the pivot table on Sheet3 the number appear as 1, 2 instead of the custom format that would show "less" and "much" strings instead of these.
On the Sheet1.F2:G5 range - which are plain cells without pivot table - these custom number formats work.

Version: 26.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 708abf24664a9a1aaeac452bcc8436026030e74e
CPU threads: 14; OS: Windows 10 X86_64 (build 19045); UI render: Skia/Raster; VCL: win
Locale: de-DE (hu_HU); UI: en-US
Calc: threaded

and back to 3.3