Those missing icons are app icons.
For instance, gnome-calculator's app icon according to its .desktop file
is now "org.gnome.Calculator"
A monochrome icon is show in GNOME Shell's top bar when calculator is
running.
Which suggests this workaround:
sudo cp /usr/share/icons/Yaru/scalable/apps/org.gnome.Calculator-
symbolic.svg /usr/share/icons/HighContrast/scalable/apps/
sudo update-icon-caches /usr/share/icons/HighContrast
Perhaps GNOME Shell should look for -symbolic icons when the theme is
set to HighContrast?
** Also affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags added: lunar
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => High
** Changed in: gnome-shell (Ubuntu)
Status: New => Triaged
** Changed in: gnome-themes-extra (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2013107
Title:
[lunar] GNOME does not display high contrast app icons
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