FrameMaker: Filter problem with CGM files?

1. Yes, the images are vector images:

In my documents the images are on a refererence page.

But it doesn't matter wether they are on a refererence page or on a body page:

Icons on the left: FM2022

Icons on the right: FM2020

Upper Icons: on a refererence page

Lower Icons: on a body page

2. And yes, I sadly do have a lot of documents with these cgm icons.

3. In Framemaker the visualisation of the icons is fine - even in the new FM2022. They are only damaged when they are converted to a PDF.

4. The cgm part in the maker.ini file hasn't changed:

FM2020: CGM Import=FileToFileGFXImport, CGM, PDF, CGM, ORBL, CGM, CGM, fminit\cgm2pdf.dll,all,^.cgm

FM2022: CGM Import=FileToFileGFXImport, CGM, PDF, CGM, ORBL, CGM, CGM, fminit\cgm2pdf.dll,all,^.cgm

5. I think, the cgm2pdf.dll file is responsible for the conversion. The file has changed from FM2020 to FM2022. I did a test: Copy the old cgm2pdf.dll from FM2020 into the FM2022 folder. But the conversion to a PDF still doesn't work properly.

I am still at a loss.