All KDE application send jobs to wrong printer queue, while all non-KDE
applications and command-line programs treat printer queues correctly.

I have several printer queues (a few cups remote printers and  Boomaga). Under
the KDE applications (Okular, Gwenview etc.) the jobs are sent in wrong
direction. E.g., when I send a job to Boomaga, it dissappears, while when I
send a job to one of my remote printers, it goes to Boomaga.

Note, that I observe this problem on OpenSUSE 42.3 only. There was no such
problem on previous versions.