KDE: VlC cone does not appear in the taskbar sometimes

I am using KDE and VLC for listening internet music.
Sometimes the VLC cone does not appear in the taskbar between trash and clipboard.

Next time this happens check in VLC: Tools-> Preferences -> Show systray icon.

After several system boots, I could reproduce this behavior:
there is no icon in the taskbar between trash and clipboard.

And the setting "show system icon" is set in preferences of VLC.

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