[okular] [Bug 462295] New: Boxes instead of text displayed for parts of PDF file

[Fabian]

https://bugs.kde.org/show_bug.cgi?id=462295

            Bug ID: 462295
           Summary: Boxes instead of text displayed for parts of PDF file
    Classification: Applications
           Product: okular
           Version: 22.08.3
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: void1 at gmx.de
  Target Milestone: ---

SUMMARY
***
Crossed out boxes displayed instead of text for the attached file from 
https://www.wahlen-berlin.de/Wahlen/BE2016/afspraes/download/SB_B07-02-03_2016j05_BE.pdf
***


STEPS TO REPRODUCE
1. Download PDF from
https://www.wahlen-berlin.de/Wahlen/BE2016/afspraes/download/SB_B07-02-03_2016j05_BE.pdf
2. Open the file with okular
3. 

OBSERVED RESULT
Red and black crossed out boxes are displayed on most pages of the file, but
text can be copied to the clipboard without problems. The only missing type 1
font is Helvetica, which was first replaced by Nimbus Sans on my system, but
after installation of Helvetica.pbf from the net and a restart of okular
(Healvetica.pbf was then used instead), the result is the same. All other fonts
are at least partial included in the file.

EXPECTED RESULT
Text in the file is displayed on all pages.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 6.0.9-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 16 Nov 2022
17:01:17 +0000 x86_64 GNU/Linux
(available in About System)
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7
PDF backend version: 0.6.5
poppler used for build: 22.10.0
poppler used at runtime: 22.11.0
X11 with okular using xcb

ADDITIONAL INFORMATION

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