Comment 0 for bug 1694037

After opening the XFCE Panel Preferences, the icon stays on Plank Dock until reboot. If you click on the icon the panel toggles between disappear or flickering.
It just happens when I open the Panel Preferences, not like https://bugs.launchpad.net/bugs/1692204

Plank Version : 0.11.3 [standard Ubuntu Repository]
Processor : 2x Intel(R) Atom(TM) CPU N455 @ 1.66GHz
Memory : 1005MB
Operating System : Linux Lite 3.4
Desktop : XFCE 4.12 from Xubuntu
Kernel : Linux 4.4.0-78-generic (x86_64)
OpenGL Renderer : Mesa DRI Intel(R) Pineview M
X11 Vendor : The X.Org Foundation
X.Org X Server : 1.18.4