The software OpenUtilities Substation has a function to create Thematic Pages, which creates specific visualizations for the designs you have made. When trying to print those pages without using rasterized option, the Microstation printing engine does not work properly, printing a bad quality PDF. My idea is to improve it, remembering that the rasterized option takes a lot of time to print a decent PDF, so it is a huge problem for designs with a lot of pages. For more specific details you can see the case CS0536962.