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If I teleport a player by moving its client origin, the position snaps to the new location just fine. However, if I change the rotation of the client origin so that the player faces east or west rather than north, for example, the camera/headset seems to lerp from the old rotation to the new rotation over the course of about one second. Is there some way to disable the rotational lerp for a teleport so that it snaps to the new value the same way position snaps?

The same issue occurs in Unity Plugin 1.2 and it seems there's no way to fix it because the called function is binarized in a dll.
Is there any way to get the source code or is it not be open?
Thank you for your sincere advice in advance.