The researchers looked at how quantum conditional probabilities work. They found that the usual rules for these probabilities don't always match up. In some cases, there isn't a correct way to show how one thing affects another in quantum physics. This means that the way things happen together in quantum physics is different from how they happen in regular, everyday life. This shows that quantum conditional probabilities are not the same as reducing a state, but this doesn't change another important rule in quantum physics.