Graphic artefact when closing a window after 2025-12-08 Stable Update (Plasma)

update went fine, sadly the new plasma 6.5 has some graphical glitch when windows are closed. When the window fades away it will show for one frame after fadeout is completed.

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I’m seeing that, too.

German desktop here, so the real naming may differ.

Open Systemsettings > Animations > Change under Desktopanimations the Field Open/Close to something else and back.

That solved it for me.

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Well done! That fixed it.

in my case, it can not fix it permanently.