Elecraft K3S bad keying issue - vs. KX2

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Elecraft K3S bad keying issue - vs. KX2

IK4EWX
The Elecraft K3S doesnt accept some semi automatic keys, the bugs.
It produce real dots when receive at his key input a short bounce, between real contacts closure, bounces barely visible on Audacity recording.
I know that this problem is known and seem that other modern rigs, for example TS590SG and same Yaesu, have the same problems.
Here I have this problem only with same great bugs (the wonderful Mecograph and Intrepid for example) and only at speed higher than 20 wpm. With the Mecograph on the K3S I have lot of dots junk emitted.
I tried to add a good electronic debouncer, but it doesnt solve the problem.
Apart my TenTec Corsair II and Cubic 102BXA, that have perfect keying with every bug and every speed up more than 30wpm, I had a big surprise with my Elecraft KX2.
Yesterday, with KX2 and Mecograph I had a long qso with a local friend, IK4DCT, at more than 25-27wpm, an hour long.
In an hour qso the KX2 doent produced a single erratic false dots.
What is the difference in the input keying circuitry between K3S and KX2?
The Elecraft K4 have the KX3 same keying circuitry kind and the same bad keying problems with bugs?
I hope in your help, I would like to solve the K3S problem.
Thanks,
Ian IK4EWX