Caption invisible when CGMs published as PDF

Hello Community

It is our industries requierement to add a caption to each illustration, to give information about projekt number etc.

This caption is invisible when the CGM files are published as PDF (screenshot: "pdf from illustrate", compare to screenshot: "cgm in illustrate").
The text of the caption can be found and located through the search function in the PDF but it can not be made visible.

My workaround is to create the files in Creo Illustrate and save them as CGM - then open them in Isodraw only to save them as CGM again. 

With this extra step the caption stays visible in the PDF (screenshot: "pdf from isodraw").

It seems that Creo Illustrate marks the Caption as metadata, so that is not to meant to be seen.

Callouts always work fine, btw.

I tried several softwares to create the PDFs, so the issue has to be somewhere in Creo Illustrate itself.

I am using Creo Illustrate 11 and Isodraw 7.4.

Any idea how to solve this is very appreciated.

Kind regards