Raster Transparency Not Printing FDOT Connect 10.10

I have raster image (Aerials) referenced where I set the transparency to 70%. Transparency is showing correctly in dgn but when I print to pdf the raster transparency is ignored. I know checking the rasterized option is a solution but the printed pdf is not text searchable. How can I have transparent raster image with text searchable pdf. Any help would be highly appreciated. I am using Open Roads Designer & FDOT Plot Config.

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