I cannot reproduce this problem with any of my printers using Adobe Myriad Pro (any variant) in a white on black context (note that you must not have "overprint on" for white on top of any other color. Please send a sample document to me off-forum (click my name for e-mail address) and I'll confirm this with your sample.
Note that the HP LaserJets are notoriously problematic with their "emulation" of PostScript. They don't use Adobe PostScript.
- Dov
- Dov Isaacs, former Adobe Principal Scientist (April 30, 1990 - May 30, 2021)