phpspread convert to PDF has no headers text color

Question

when spreadsheet(xlsx) convert to PDF , header's text looks like does not have color, Its color must be "no white".

my steps..

1. $this->sheet->getHeaderFooter()->setOddHeader('&L&K000000 left text &R page number &P / &N");
2. save xlsx
3. convert to pdf ( soffice command )

step2) xlsx have header's color ,looks like fine. but, step3) pdf has no header's color ( text color is white , &K000000 does not work.. )

version of does not work phpspread:1.29.0 Libreoffice:7.2.7.2

old version , header's text color default is 000000, so after convert pdf looks like works fine. version of works fine phpspread:1.9.0 LibreOffice:5.3.6.1