[okular] [Bug 526507] New: Highlights saved in 21.12.3 are not visible in new 26.04.3 (they lost their positions)

[Bookworm]

https://bugs.kde.org/show_bug.cgi?id=526507

            Bug ID: 526507
           Summary: Highlights saved in 21.12.3 are not visible in new
                    26.04.3 (they lost their positions)
    Classification: Applications
           Product: okular
      Version First 26.04.3
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: EPub backend
          Assignee: okular-devel at kde.org
          Reporter: ys.prism at gmail.com
  Target Milestone: ---

Created attachment 196750
  --> https://bugs.kde.org/attachment.cgi?id=196750&action=edit
screenshot of the problem introduced in 26.04.3 version

DESCRIPTION
I was reading a book in EPUB format and made some highlights. The book was
saved in 21.12.3.

After I installed a new version of Okular (26.04.3) in flatpak and opened this
file I cannot see my highlights anymore.


STEPS TO REPRODUCE
1. Open an EPUB document in 21.12.3
2. Make some highlights and save it in .okular format
3. Start new version 26.04.3 
4. Open saved file
5. All highlights seem to lost their positions.



OBSERVED RESULT
Attaching pic

EXPECTED RESULT
Highlights have to be in their places

SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window): Ubuntu 22.04
KDE Plasma Version: not installed
KDE Frameworks Version: flatpak
Qt Version: flatpak

ADDITIONAL INFORMATION

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