However your project assumes that the arc is a half circle (you used tangency constraints at the 2 points), which isn't always the case. The project you attached is correct indeed, as is my example project with the partial redundancy removed. So this should fully constrain the arc, and as chrisb had pointed out, the issue is caused by partial constraint redundancy, and not lack of constraints. The whole arc is created as external geometry in the 2nd sketch, and the normal arc is created using the external center and 2 points. The arc in the master sketch is defined through center + 2 points (a center with 2 points define exactly an arc, actually 2 complementary arcs). You need here to refer to the center and one end of the 1st arc. You cannot copy an arc with 3 points : an arc is 5 Degrees of Freedom (dof) and 3 points are 6 dof.
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