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As far as I know, it is not a engine mechanical problem.
ECU is not a cause of problem.
But signal, which go from ECU to ignition coil to 1-2 cylinders is a problem.
But, actual cause is still unknown.
The question is, how ignition signal is formed and which signals do alter ignition signal waveform.
And, why it is only on second and little on 1 cylinder? Misfires are like 90% on second cylinder, and 10% on first.
It have been approved, that they happens because of altered waveform from ECU on ignition coil 1, which drives 1 and 2 cylinders.
But original problem is not in ECU itself. That had been also approved.
It is possible, that on forming ignition signal affects signals from knock sensor, from camshaft position sensor and crankshaft position sensor.
On similar case, it was knock sensor and or wiring to it. How? Nobody is sure.
I will test it myself soon.