Stopping ligatures in konsole

Question

After upgrading to Fedora 29 konsole has started to use ligatures for my monowidth fonts (currently Inconsolata), which is beyond terrible for example when it decides to combine "fi". I have futzed with fontconfig tweaks like the following, to no avail:

$ cat ~/.config/fontconfig/fonts.conf
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <description>Disable ligatures for monospaced fonts to avoid ff, fi, ffi, etc. becoming only one character wide</description>
  <match target="font">
    <test name="family" compare="contains" ignore-blanks="true">
      <string>Inconsolata</string>
    </test>
    <edit name="fontfeatures" mode="append">
      <string>liga off</string>
      <string>dlig off</string>
    </edit>
  </match>
</fontconfig>

I can work around it by switching fonts, but this behavior is just unhelpful. How do I properly prevent konsole from using any kind of ligatures for my fonts?