Created attachment 161951 [details]
Errorneuos PDF document

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1. Download the following PDF document: https://mittlerer-niederrhein.ihk.de/de/media/pdf/aus-und-weiterbildung/ausbildung-neu/formulare/antrag-fuer-eine-zweitschrift.pdf (also attached to this bug report)
2. Show the forms.
3. In the name field, enter a name with accented characters, like "Chloé"
4. Exit the form mode

OBSERVED RESULT
The é is displayed as the empty set symbol.

EXPECTED RESULT
It should've been displayed as é.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Kernel Version: 6.5.5-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-6500 CPU @ 3.20GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 960/PCIe/SSE2
Manufacturer: MSI
Product Name: MS-7978
System Version: 2.0

ADDITIONAL INFORMATION

It's printed correctly, in the edit mode it's also shown as intended. I don't know whether it's a bug in the file itself or in Okular, therefore this report. Feel free to close it if it's not a bug in the software. :3