Is it for possible an accidental discharge to occur when there is a type 3 malfunction?

Rule number one of being a responsible gun owner, is "always expect the unexpected and always treat the gun as if it's loaded." Although it is very uncommon for a gun to misfire during a class 3 malfunction, I will not say it is impossible. I only own Glock hand guns, so I can only speak for strike fire weapons. Typically during a class 3 double feed the new unfired round will not be in alignment with the firing pin, thus making an accidental discharge highly unlikely. I would recommend taking classes with a trained firearms instructor on clearing malfunctions before practicing on your own.