The electron cloud is just a way of predicting what the observer will see on future observations of the electron. When an observation is made, the range of what might be possibly seen in future observations is reduced. So starting right from the moment an observation is made, the observer’s knowledge about the electron is described by a new wave which applies until the observer makes another observation. But the apparent wave behaviour does not cease. It just changes to that new wave, and the electron is never seen to behave like a classical particle. In fact, it is not actually ever either a classical particle with a definite position or a wave of some definite form, and the question of what it “is” may not have any real meaning. All we can talk about are the probabilities of various observations – which we know from experiments do not correspond to any classical picture of what is going on.