formula missing on pdf export

Hi
I have a project with formula but when I decide to export as pdf all formula missing either in print .it is Ok on print preview but not in pdf .I use standard font and cups-pdf .there is a sample that show my pdf
link(http://s9.picofile.com/file/8355886126/Screenshot_from_2019_03_26_09_03_49.png)

Hello, from your description I assume, that your understanding of “PDF export” is: “Print using CUPS with CUPS-PDF backend”. But there is a special “Export to PDF” function in LibreOffice at File -> Export As -> Export as PDF. Have you tried this type of PDF export ?

Hello ,Thanks for answer ,yes I used it but there is same problem

hey when I try to insert formula with persian number font and right to lett formula the problem appear .the question is when I can’t use persian font number with standard font what can I do?

You can file a bug report

thanks ,But I think someone else reported as a bug ,and there is a solution for who wants to use before solve bug.use textbox and put formula on it and set ltr for formula , so I think that it will help you a bit