It looks like indeed a bug due to the new Icon theme support, in GNOME Shell though.
** Changed in: yaru-theme (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/2013107 Title: [lunar] GNOME does not display high contrast app icons Status in Yaru Theme: New Status in gnome-shell package in Ubuntu: Triaged Status in gnome-themes-extra package in Ubuntu: Invalid Status in yaru-theme package in Ubuntu: Won't Fix Bug description: gnome-accessibility-themes (3.28-2ubuntu1) offers an incomplete set of high contrast icons, resulting in a very inconsistent look when the user enables Accessibility > Seeing > High Contrast from gnome- control-center. A screenshot showing of the current sad state of affairs is attached. To manage notifications about this bug go to: https://bugs.launchpad.net/yaru/+bug/2013107/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp