SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** I followed https://develop.kde.org/docs/extend/plasma/theme/theme-details/#use-icons-from-icon-theme, but it doesn't work. For example, if you do it with the battery icons, the battery plasmoid stops showing an icon. Again, if you do it with the network icons the network plasmoid doesn't show the Wi-Fi signal, just a solid Wi-Fi icon. STEPS TO REPRODUCE 1. For example, go to /usr/share/plasma/desktoptheme/<your global theme>/icons/ and rename battery.svgz (If it exists) to battery.svg 2. Inside battery.svg, write "<svg></svg>" 3. Log Out and In and check the battery plasmoid. OBSERVED RESULT The battery plasmoid has no icon EXPECTED RESULT The battery plasmoid should have the icon from the icon theme SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Manjaro 22.0 (available in About System) KDE Plasma Version: 5.25.5 KDE Frameworks Version: 5.97.0 Qt Version: 5.15.5 ADDITIONAL INFORMATION
I have the same problem. Most icons get taken from the icon themes just fine, but a few simply refuse not show up. I found that the broken wifi icon is actually a problem with the Breeze icon theme, which is missing at least the following icons: network-wireless-0 network-wireless-0-locked network-wireless-20 network-wireless-20-locked network-wireless-40 network-wireless-40-locked network-wireless-60 network-wireless-60-locked network-wireless-80 network-wireless-80-locked network-wireless-100 network-wireless-100-locked network-wireless-off network-wireless-on However, there are also icons that I was completely unable to get to show up. These are the "Notifications" icon, the "Battery and Brightness" icon (as already mentioned) and the audio icon, specifically the task manager one used to mute and unmute individual tasks. The "Audio Volume" applet icon shows up completely fine.
Closing this as with Plasma 6, icons from Plasma themes are no longer supported.