1-stop overexposure
?
When considering such issues, the first thing to clarify is always how the light was measured. If I simply hold a camera like the Canon up to the sky and rely on its metering, I already get underexposure when 1/3 of the sky is in the frame, judging by the black hand at the bottom in the shade. In the case of a supposed ‘overexposure’, as shown here, I wouldn’t worry about it, but would develop the film as normal.