SUMMARY

When selecting a print range in Okular, the print range is related to the actual rendered pages, not to the page numbering in the PDF document.  If the multiple pages print setting is used, the print range in the document is not printed but instead the range of rendered pages is printed.  This makes it impossible to correctly print multiple page ranges as well as the correct pages in a single page range.

STEPS TO REPRODUCE
1. Open a PDF with a number of pages, eg. 20 pages
2. Select pages 1-4 in the print range
3. Select multiple page printing 2x2

OBSERVED RESULT

Pages 1-8 of the document are printed (on 4 sheets of paper or 2 double sided pages), because Okular interprets the print range as the number of pages to be printed after multiple-page-per-sheet rendering.  
EXPECTED RESULT

Pages 1-4 should be printed, (on 2 sheets of paper, or 1 double sided page) as the user has selected this page range from the actual PDF.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 20.04
Okular 1.9.3
(Also observed in Raspbian on RPi4)

ADDITIONAL INFORMATION
All other PDF readers print the page range specified in the document, not in the rendered pages.