I can't generate CHM in non-English Language Like Arabic/Persian/...

Hello

In robohelp 2019, I Create a project and set language to Arabic:

Add a Arabic Topic and then set CHM language to Arabic:

often I can generate chm file without get any message:

rarely I generate chm file, but chm haven't readable text:

How can I generate Arabic or Farsi CHM file without error with readable alphabets?

Thanks.