NOTE: There are at least two PCL 3GUI printers that are reported to work, so the issue might be a little more nuanced. HP OfficeJet Pro 7720 and HP Officejet Pro 8600 N911a are PCL 3GUI printers that have been reported as working.
For others that come along here, it looks like the issue is with printers that use PCL 3GUI. From HP's site
"PCL3GUI remains proprietary. HP uses it in the HP DeskJet series printers and DesignJet larger format printers (plotters)."