I don't have any answers but might have a related issue. This seemed to change when converting to v2.5. After I export a layout to PDF (vector), and print, all of the vector line work AND line types goes to a similar thin and continuous style. The color is maintained. This also happened when I exported the file to AIX, made some edits to linework in Adobe Illustrator and printed that result.
Example image attached, please excuse the blurriness and the color conversion of the printed version:
Yes, the workaround is to export it as a raster PDF but I'd rather not to help with file size, keeping the line work clean, and using the line work in other post-processing software (ex. Illustrator, Rhino, etc.). I only have one printer to test this on, so it could be the device. If you think that is the case, is there a typical Printer Property I should try managing?