When I work with the Unreal Editor, the KWin compositing gets turned off automatically every few minutes.
This is very annoying, since this causes tearing and makes the tooltips in the editor rendering buggy.
I have to manually re-enable it by pressing Alt+Shift+F12, only to have it somehow automatically get turned off again after a few minutes.

Is there any way to disable this behaviour and force compositing on all the time?

I'm using kwin-5.6.5-r1.

I fixed it, using the information provided in the comment of this bug: https://bugs.kde.org/show_bug.cgi?id=361154

Run "kcmshell5 kwinrules" and create a blind rule (just don't press the
detect button),name it whatever you want, then go to the last tab Appearance
and Fixes
-> "Block Compositing" -> Force -> "No"