Created attachment 106762 [details] screenshot My screenshot is from neon dev unstable. Install this icon theme https://store.kde.org/p/1182967 Check your device notifier.
the same happens on Arch (plasma 5.10.4) when I use oranchelo icon theme https://store.kde.org/p/1151321/show/page/2
Git commit b8f263cd9939530a6634a1ddb9533bf473a67805 by Kai Uwe Broulik. Committed on 23/08/2017 at 09:10. Pushed by broulik into branch 'Plasma/5.8'. [Device Notifier] Set preferred size for ActionItem In QtQuick Layouts implicit size (set by IconItem to the SVG's natural size) takes precedence over width/height. This was fixed in DeviceItem but forgotten here. FIXED-IN: 5.8.8 M +2 -2 applets/devicenotifier/package/contents/ui/ActionItem.qml https://commits.kde.org/plasma-workspace/b8f263cd9939530a6634a1ddb9533bf473a67805