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Same happens with my machines.
The apps are there but the icons are replaced by a placeholder. The apps themselves are working properly. The icons for "copy, copy location, duplicate here" in dolphins context menu, you showed in the second screenshot are the same as in Plasma 5. No changes. In system settings only the icon for "online access" is beeing replaced (As far I've looked).
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Same here. A bug report is open :
https://bugs.kde.org/show_bug.cgi?id=481402
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To fix the missing icons, I created these symbolic links in the directory ~/.local/share/icons
oxygen
oxygen/base
oxygen/base/22x22
oxygen/base/22x22/actions
oxygen/base/22x22/actions/notification-active.png -> /usr/share/icons/oxygen/base/22x22/apps/preferences-desktop-notification-bell.png
oxygen/base/22x22/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/22x22/apps/preferences-desktop-notification.png
oxygen/base/22x22/status
oxygen/base/22x22/status/media-playback-playing.png -> /usr/share/icons/oxygen/base/22x22/actions/media-playback-start.png
oxygen/base/22x22/status/media-playback-stopped.png -> /usr/share/icons/oxygen/base/22x22/actions/media-playback-stop.png
oxygen/base/22x22/status/media-playback-paused.png -> /usr/share/icons/oxygen/base/22x22/actions/media-playback-pause.png
oxygen/base/16x16
oxygen/base/16x16/actions
oxygen/base/16x16/actions/notification-active.png -> /usr/share/icons/oxygen/base/16x16/apps/preferences-desktop-notification-bell.png
oxygen/base/16x16/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/16x16/apps/preferences-desktop-notification.png
oxygen/base/16x16/status
oxygen/base/16x16/status/media-playback-playing.png -> /usr/share/icons/oxygen/base/16x16/actions/media-playback-start.png
oxygen/base/16x16/status/media-playback-stopped.png -> /usr/share/icons/oxygen/base/16x16/actions/media-playback-stop.png
oxygen/base/16x16/status/media-playback-paused.png -> /usr/share/icons/oxygen/base/16x16/actions/media-playback-pause.png
oxygen/base/128x128
oxygen/base/128x128/actions
oxygen/base/128x128/actions/notification-active.png -> /usr/share/icons/oxygen/base/128x128/apps/preferences-desktop-notification-bell.png
oxygen/base/128x128/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/128x128/apps/preferences-desktop-notification.png
oxygen/base/48x48
oxygen/base/48x48/actions
oxygen/base/48x48/actions/notification-active.png -> /usr/share/icons/oxygen/base/48x48/apps/preferences-desktop-notification-bell.png
oxygen/base/48x48/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/48x48/apps/preferences-desktop-notification.png
oxygen/base/48x48/status
oxygen/base/48x48/status/media-playback-playing.png -> /usr/share/icons/oxygen/base/48x48/actions/media-playback-start.png
oxygen/base/48x48/status/media-playback-stopped.png -> /usr/share/icons/oxygen/base/48x48/actions/media-playback-stop.png
oxygen/base/48x48/status/media-playback-paused.png -> /usr/share/icons/oxygen/base/48x48/actions/media-playback-pause.png
oxygen/base/64x64
oxygen/base/64x64/actions
oxygen/base/64x64/actions/notification-active.png -> /usr/share/icons/oxygen/base/64x64/apps/preferences-desktop-notification-bell.png
oxygen/base/64x64/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/64x64/apps/preferences-desktop-notification.png
oxygen/base/32x32
oxygen/base/32x32/actions
oxygen/base/32x32/actions/notification-active.png -> /usr/share/icons/oxygen/base/32x32/apps/preferences-desktop-notification-bell.png
oxygen/base/32x32/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/32x32/apps/preferences-desktop-notification.png
oxygen/base/32x32/status
oxygen/base/32x32/status/media-playback-playing.png -> /usr/share/icons/oxygen/base/32x32/actions/media-playback-start.png
oxygen/base/32x32/status/media-playback-stopped.png -> /usr/share/icons/oxygen/base/32x32/actions/media-playback-stop.png
oxygen/base/32x32/status/media-playback-paused.png -> /usr/share/icons/oxygen/base/32x32/actions/media-playback-pause.png
hicolor/scalable
hicolor/scalable/actions
hicolor/scalable/actions/window-pin.svg -> /usr/share/icons/breeze/actions/22/window-pin.svg
hicolor/scalable/actions/brightness-high.svg -> /usr/share/icons/breeze/actions/22/brightness-high.svg
hicolor/scalable/actions/brightness-low.svg -> /usr/share/icons/breeze/actions/22/brightness-low.svg
hicolor/scalable/status
hicolor/scalable/status/redshift-status-on.svg -> /usr/share/icons/breeze/status/24/redshift-status-on.svg
hicolor/scalable/status/redshift-status-day.svg -> /usr/share/icons/breeze/status/24/redshift-status-day.svg
hicolor/scalable/status/redshift-status-off.svg -> /usr/share/icons/breeze/status/24/redshift-status-off.svg
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What is the logic for selecting the icons and the names? I want to do the same thing for more icons.
To fix the missing icons, I created these symbolic links in the directory ~/.local/share/icons
oxygen oxygen/base oxygen/base/22x22 oxygen/base/22x22/actions oxygen/base/22x22/actions/notification-active.png -> /usr/share/icons/oxygen/base/22x22/apps/preferences-desktop-notification-bell.png oxygen/base/22x22/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/22x22/apps/preferences-desktop-notification.png oxygen/base/22x22/status oxygen/base/22x22/status/media-playback-playing.png -> /usr/share/icons/oxygen/base/22x22/actions/media-playback-start.png oxygen/base/22x22/status/media-playback-stopped.png -> /usr/share/icons/oxygen/base/22x22/actions/media-playback-stop.png oxygen/base/22x22/status/media-playback-paused.png -> /usr/share/icons/oxygen/base/22x22/actions/media-playback-pause.png oxygen/base/16x16 oxygen/base/16x16/actions oxygen/base/16x16/actions/notification-active.png -> /usr/share/icons/oxygen/base/16x16/apps/preferences-desktop-notification-bell.png oxygen/base/16x16/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/16x16/apps/preferences-desktop-notification.png oxygen/base/16x16/status oxygen/base/16x16/status/media-playback-playing.png -> /usr/share/icons/oxygen/base/16x16/actions/media-playback-start.png oxygen/base/16x16/status/media-playback-stopped.png -> /usr/share/icons/oxygen/base/16x16/actions/media-playback-stop.png oxygen/base/16x16/status/media-playback-paused.png -> /usr/share/icons/oxygen/base/16x16/actions/media-playback-pause.png oxygen/base/128x128 oxygen/base/128x128/actions oxygen/base/128x128/actions/notification-active.png -> /usr/share/icons/oxygen/base/128x128/apps/preferences-desktop-notification-bell.png oxygen/base/128x128/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/128x128/apps/preferences-desktop-notification.png oxygen/base/48x48 oxygen/base/48x48/actions oxygen/base/48x48/actions/notification-active.png -> /usr/share/icons/oxygen/base/48x48/apps/preferences-desktop-notification-bell.png oxygen/base/48x48/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/48x48/apps/preferences-desktop-notification.png oxygen/base/48x48/status oxygen/base/48x48/status/media-playback-playing.png -> /usr/share/icons/oxygen/base/48x48/actions/media-playback-start.png oxygen/base/48x48/status/media-playback-stopped.png -> /usr/share/icons/oxygen/base/48x48/actions/media-playback-stop.png oxygen/base/48x48/status/media-playback-paused.png -> /usr/share/icons/oxygen/base/48x48/actions/media-playback-pause.png oxygen/base/64x64 oxygen/base/64x64/actions oxygen/base/64x64/actions/notification-active.png -> /usr/share/icons/oxygen/base/64x64/apps/preferences-desktop-notification-bell.png oxygen/base/64x64/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/64x64/apps/preferences-desktop-notification.png oxygen/base/32x32 oxygen/base/32x32/actions oxygen/base/32x32/actions/notification-active.png -> /usr/share/icons/oxygen/base/32x32/apps/preferences-desktop-notification-bell.png oxygen/base/32x32/actions/notification-inactive.png -> /usr/share/icons/oxygen/base/32x32/apps/preferences-desktop-notification.png oxygen/base/32x32/status oxygen/base/32x32/status/media-playback-playing.png -> /usr/share/icons/oxygen/base/32x32/actions/media-playback-start.png oxygen/base/32x32/status/media-playback-stopped.png -> /usr/share/icons/oxygen/base/32x32/actions/media-playback-stop.png oxygen/base/32x32/status/media-playback-paused.png -> /usr/share/icons/oxygen/base/32x32/actions/media-playback-pause.png hicolor/scalable hicolor/scalable/actions hicolor/scalable/actions/window-pin.svg -> /usr/share/icons/breeze/actions/22/window-pin.svg hicolor/scalable/actions/brightness-high.svg -> /usr/share/icons/breeze/actions/22/brightness-high.svg hicolor/scalable/actions/brightness-low.svg -> /usr/share/icons/breeze/actions/22/brightness-low.svg hicolor/scalable/status hicolor/scalable/status/redshift-status-on.svg -> /usr/share/icons/breeze/status/24/redshift-status-on.svg hicolor/scalable/status/redshift-status-day.svg -> /usr/share/icons/breeze/status/24/redshift-status-day.svg hicolor/scalable/status/redshift-status-off.svg -> /usr/share/icons/breeze/status/24/redshift-status-off.svg
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What is the logic for selecting the icons and the names? I want to do the same thing for more icons.
The idea is to replace the missing icons with icons present in the standard packages. The logic is documented here :
https://specifications.freedesktop.org/icon-theme-spec
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