Physical cannot be the cause of its own change This idea that "the physical" and time are separate is so strange to me. Physical things only are what they are because of their relationship to time. You don't have "physical things" in one box, and then "time" separate. Without time, there are no physical things.
Everything we know of as physical emerges from, presumably, the behaviour of how quantum fields evolve and interact over time. Quantum fields are defined by how they change over time, and how they relate to other quantum fields. It's not that they're "the cause of their own change", it's more that the way in which they change is part of their very definition - they are what they are because they change in those ways. If they changed in other ways, they'd be something else.