[okular] [Bug 484248] New: Filled form in pdf are invisible for some pdf

[Mancausoft]

https://bugs.kde.org/show_bug.cgi?id=484248

            Bug ID: 484248
           Summary: Filled form in pdf are invisible for some pdf
    Classification: Applications
           Product: okular
           Version: 24.02.0
          Platform: Flatpak
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: andreamilazzo at mancausoft.org
  Target Milestone: ---

Created attachment 167608
  --> https://bugs.kde.org/attachment.cgi?id=167608&action=edit
List of font

SUMMARY
Filling the pdf that you can get from the Polish government:
https://bip.malopolska.pl/e,pobierz,get.html?id=3306136&file=undefined
you can see data when you fill it, but when you disable 'show form' the form is
blank

STEPS TO REPRODUCE
1. Download  pdf
https://bip.malopolska.pl/e,pobierz,get.html?id=3306136&file=undefined
2. open with okular 
3. click on `show form`
3. Fill surname 
4. click again on `show form`
OBSERVED RESULT

The text of the form will be invisible

EXPECTED RESULT

The text should be rendered 

ADDITIONAL INFORMATION

I tried before with okular 22.12.3 from debian stable, and after I install also
okular (24.02.0) from flatpack and get the same result

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