All four in Jabiru 2200 aircraft.
Two engines cut out short final when power reduced to idle for landing.
One cut out during a stall practice at 4000ft in training area accompanied by a wing drop at the stall. Exciting! Restarted ok.
I chuckled when I read this, so you have had one genuine engine failure that can be attributed to the condition of the engine.
Adjustment of the idle stop is hardly a fault of the engine or engine manufacturer !