Is it? It's quite uncontroversial I think that consciousness has no special impact in physics, there's no physical experiment that is affected by a consciousness being present or not. Electrons don't behave differently if a human is looking at them versus a machine, as far as any current physical experiment has ever found.

If we agree on this, then it follows logically that we don't need new physics to explain consciousnesses. I'm not claiming it's impossible that consciousness is created by physics we don't yet know - just claiming that it's also not impossible that it's not. Similarly, we don't fully understand the pancreas, and it could be that the pancreas works in a way that isn't fully explainable by current physics - but there's currently no reason to believe that, so we shouldn't assume that.