After upgrade to 4.0.1-1 I see: {"MessageId":"Get_Export_Formats_Resp","SendTime":1551866212880,"Values":[ {"Label":"PDF Document (.pdf)","Format":"pdf"}, {"Label":"ODF text document (.odt)","Format":"odt"}, {"Label":"Word 2003 Document (.doc)","Format":"doc"}, {"Label":"Word Document (.docx)","Format":"docx"}, {"Label":"Rich Text (.rtf)","Format":"rtf"}, {"Label":"PDF Document (.pdf)","Format":"pdf"}, {"Label":"ODF text document (.odt)","Format":"odt"}, {"Label":"Word 2003 Document (.doc)","Format":"doc"}, {"Label":"Word Document (.docx)","Format":"docx"}, {"Label":"Rich Text (.rtf)","Format":"rtf"} ]} As you can see the list contains all entries duplicated.
Very interesting! Thanks you http://supersmashflash2s.com
Andras Timar committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/online/commit/36eed0c6f07cef512ec83fb8c22d2c6200e7ce5c tdf#123892 deduplicate entries in Get_Export_Formats_Resp