Created attachment 103605 [details] stock_folder icon overwrite bug KDE Plasma Version: 5.8.3 KDE Frameworks Version: 5.26.0 Qt Version: 5.6.2 As a regular user setting an a custom icon through dolphin's folder properties dialog on a root owned folder results in all stock_folder icons being overwritten. To try and replicate: - Right click any root owned folder (e.g /mnt/) and open the Properties dialog - Change the default icon to something else - refresh dolphins view and the icon becomes default for all folders instead of just the selected folder.
You are not setting a custom icon (you cannot do that on root-owned folders), you are changing the *default* icon for the inode/directory mimetype (through keditfiletype5, not part of Dolphin but of kde-cli-tools). This is why you see that icon on all the folders, is the intended behavior.