In inkscape 0.92, the problem is still present.
Example: http://www.financnisprava.cz/assets/tiskopisy/5405_23.pdf
It is easy to work-around this problem manually: Save document, open in the text editor, and the carefully replace affected ocurrences of ">f" by ">fi", and repeat the same for ff, fl, ffi, ffl.
In inkscape 0.92, the problem is still present.
Example: http:// www.financnispr ava.cz/ assets/ tiskopisy/ 5405_23. pdf
It is easy to work-around this problem manually: Save document, open in the text editor, and the carefully replace affected ocurrences of ">f" by ">fi", and repeat the same for ff, fl, ffi, ffl.