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the problem happen on my desktop (amd GPU) and two laptop (intel GPU).
it is the same: it is like some part of the screen are not updated/refreshed, sometimes opening thge windows make them ppear and disappear, and thing like that.
forcing the wiondows to update (like moving it, resizing, scrolling) is a workaround for when opening a window it is not repainted.
i realli like the plasma-next, but it is too bugged, it worst than kde4
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seems a problem with driver, fixed with export KWIN_USE_BUFFER_AGE=0
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