[okular] [Bug 469455] New: Certain common math character not rendered

[Corbin]

https://bugs.kde.org/show_bug.cgi?id=469455

            Bug ID: 469455
           Summary: Certain common math character not rendered
    Classification: Applications
           Product: okular
           Version: 23.04.0
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: schwimmbeckc at gmail.com
  Target Milestone: ---

SUMMARY

I'm reading a scientific paper and came across a strange gap. Using other pdf
readers like the ones provided by firefox and chromium browsers, the symbol was
rendered correctly. The symbol in question being ∈. For some reason, it doens't
render, leaving a blank void. The text can be copied, however, which results in
this: `he  ∈` and sometimes this `den ∈`, it appears to be random. It's
possible this issue may need to be escalated to whoever maintains the poppler
backend, if that's where the issue lies.

The file in question is freely available here:
https://www.dbs.ifi.lmu.de/Publikationen/Papers/KDD-96.final.frame.pdf
The problem appears a lot on page 3.

STEPS TO REPRODUCE
1. Open the example pdf
2. Scroll to page 3

OBSERVED RESULT

There is a blank void where the character should be.

EXPECTED RESULT

The character should be rendered correctly.

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux 
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Kernel Version: 6.2.12-1-MANJARO (64-bit)
Graphics Platform: X11

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