Shadow Caster Count Doubles When setting StereoProjectionMatrix

When I use the method SetStereoProjectionMatrix on an single Oculus VR Camera, I immediately lose all shadow caster optimizations until I call ResetStereoProjectionMatrices again. Even if I simply set the stereoprojectionmatrix to itself, my shadow caster count immediately doubles:

GetComponent<Camera> ().SetStereoProjectionMatrix(Camera.StereoscopicEye.Left, GetComponent<Camera> ().GetStereoProjectionMatrix(Camera.StereoscopicEye.Left));

Is there a way to set the stereoprojectionmatrix of...

Shadow Caster Count Doubles When setting StereoProjectionMatrix