I’ve been running Netrunner Rolling for several months without this issue, so the driver should support the effect. If the compositer is not running, then how would I go about fixing that problem?
I’m not sure what could have caused the issue other than the settings have been changed, a driver update, or a kernel update.
I would first check your compositor settings under system settings and make sure it is still enabled, and using the correct openGL mode for your drivers / GPU.
Plasma, frameworks and QT haven’t been updated in a while now as the Manjaro team are still trying to find a solution to QT 5.7 breaking theme support with GTK applications.