First guess is to check the clearance between the caliper hardware and the rotor. If they metal “clips” are installed incorrectly or deformed, the rotor can come into contact with them as things flex/deflect through a turn.
The last time something similar happened to me, it was a tiny rock caught between the backing plate and the caliper bracket so perfectly that it only made noise at random and could not be easily seen even with the wheel off.
The last time something similar happened to me, it was a tiny rock caught between the backing plate and the caliper bracket so perfectly that it only made noise at random and could not be easily seen even with the wheel off.