Created attachment 138345 [details]
Umlauts visible in text window, but not in pdf

SUMMARY

Umlauts entered into an pdf are not visible

STEPS TO REPRODUCE
1. Load any pdf document
2. Select "Insert Text" tool and type "ä, ü, ö" and "a, u, o" into the text window, then accept via "OK" button
3. Check at the selected area to insert text if the characters are visible

OBSERVED RESULT

Umlauts are visible in text window, but are missing at selected location of pdf file, not even blanks are shown. The "normal" characters can be seen as expected.

EXPECTED RESULT

Umlauts are visible as well in thze pdf after accept text window.

SOFTWARE/OS VERSIONS 
Linux/KDE Plasma: Manjaro KDE
(available in About System)
KDE Plasma Version:  Plasma 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION