Public bug reported:

I ordinarily run KUbuntu 18.04 with desktop compositing enabled, using
OpenGL 3.1 and this works quite well.

However on some occasions when compositing gets disabled, either because
a game disables it or when I manually disable it in the configuration
panel, Plasmashell's taskbar stops updating and its appearance gets
replaced with an old version.

I can tell because the application taskbar buttons are not correct and
the hour is also not the right one. Reactivating composition restores
normal behaviour. Only the display is affected : even if some
application button is not displayed, I can still click on it if I
remember where it is.

The information displayed during this problem is always the same until I
kill plasmashell and restart it. What is displayed seems to be the state
when plasmashell was last (re)started, or when the computer resumed from
either suspend or hibernation.

** Affects: plasma-workspace (Ubuntu)
     Importance: Undecided
         Status: New

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Bugs, which is subscribed to plasma-workspace in Ubuntu.
https://bugs.launchpad.net/bugs/1811214

Title:
  plasmashell stops updating when compositing is disabled

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