On a semi-related note, KDE Plasma has been waiting for the desktop cube effect to return since a little over a year ago. Plasma 5.23 was when it unfortunately removed due to the code being incompatible with the underlying API changes and requiring a large rewrite before it can come back.
The relevant bug report is here: https://bugs.kde.org/show_bug.cgi?id=438883
The relevant bug report is here: https://bugs.kde.org/show_bug.cgi?id=438883
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