[okular] [Bug 441623] New: Some PDFs are completely blank

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=441623

            Bug ID: 441623
           Summary: Some PDFs are completely blank
           Product: okular
           Version: 21.08.0
          Platform: Mint (Ubuntu based)
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: rms.des.web at gmail.com
  Target Milestone: ---

Created attachment 141095
  --> https://bugs.kde.org/attachment.cgi?id=141095&action=edit
PDF that appears blank in Okular

SUMMARY
when opening some PDFs with Okular, the display shows only underlines of links.

STEPS TO REPRODUCE
1. Open attached PDF with Okular

OBSERVED RESULT
Blank PDF

EXPECTED RESULT
PDF displayed correctly.

SOFTWARE/OS VERSIONS
Windows: NA
macOS: NA
Linux/KDE Plasma: Linux 5.4.0-81-generic (Linux Mint 20.1)
(available in About System)
KDE Plasma Version: NA
KDE Frameworks Version: KDE Frameworks 5.85.0
Qt Version: Qt 5.15.3 (built against 5.15.3)

ADDITIONAL INFORMATION
Seem to be related to BUG https://bugs.kde.org/show_bug.cgi?id=334343
I assume it is a Poppler problem, but could not get it to work, even trying
different updates.
Tried different software sources/versions (apt/snap/deb/flatpak), with similar
results.
Currently using flatpak.
In my previous Ubuntu 18.04 installation, I did not face these problems with
Okular.

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