If you build it I will install it. Know what just for fun i'll remove whatever window manager you have as a default (it's either mutter or deepin-wm). Then install kwin and then replace it with:https://forum.manjaro.org/t/kwinft-and-wrapland-drop-in-replacements-for-kwin-and-kwayland/136222 and see if it goes 
It shouldn't I did it a while ago. disclaimer fi you do this you will need to also install the system-settings package if you want to use transparency and to clear up a grainy panel blur issue. You just need to decrease the gain.
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