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