Problem converting AutoCAD with ole object to pdf

I have a problem when I convert an AutoCAD drawing with a ole object.

When I convert it the AutoCAD drawing ole object isn’t showing on the pdf.

When I make a reference file (PNG format) of the ole object it is showing on the pdf.

I’m working with Acrobat Adobe DC pro and AutoCAD 2020.

I tested it also with AutoCAD 2013 with the same result.

Unfortunately when we send the native file to our costumer, reference files are not allowed.

Can anyone help me with this problem?

Thanks in advanced.