Please click this link for the screenshot, http://postimg.org/image/70sc3lfcx/
I'm a Chinese user of KDE plasma 5, when a copy or move action is done from dolphin file manager, a circle icon with "1" displayed in the system tray zone, but problem is USB icon and time is overlapped as you can see in the screenshot(上午 11:29 meaning 11:29 AM), then click notify icon to close the notification and then time back to normal.

What version of Plasma are you running? I *think* this is fixed by Plasma 5.3 (at least, I haven't seen it in a while).

[jsntyyl@panasonic ~]$ pacman -Qi plasma-workspace
Name : plasma-workspace
Version : 5.2.2-2
Description : KDE Plasma Workspace
Architecture : i686

If it is fixed in plasma 5.3, that will be a good news to hear.

einar wrote:What version of Plasma are you running? I *think* this is fixed by Plasma 5.3 (at least, I haven't seen it in a while).

[jsntyyl@panasonic ~]$ pacman -Qi plasma-workspace
Name : plasma-workspace
Version : 5.2.2-2
Description : KDE Plasma Workspace
Architecture : i686

If it is fixed in plasma 5.3, that will be a good news to hear.

Reply to myself, it is the same at latest plasma 5.3, sad...

Reply to myself again, this problem has solved by re-size the panel a little bit, then set panel size to maximum, don't know why this happen.