Comment # 17 on bug 1054374 from Dave Plater

(In reply to Per Jessen from comment #15)
> I can confirm, the printer dialogue now has an "Advanced" tab.  However,
> despite selecting media size A4, type = labels and source = cassette1 it
> wanted to print on A5 from the multi form feeder.  I tried it twice.
Must be related to reading the PPD. Look for another qt5 bug.

I looked through the patches and there's a few qt5 printing related functions
that may cause problems.
I'll add okular to my test repo.