Focus for MultiCam

HI,
I am working on an app that uses both 1x and 2x cameras in a multicam session. When I issue focus commands on AVCaptureDevice objects back to back, I am seeing that sometimes one of them does not focus properly. Is there any physical limitation (on power rails for instance) that prevents iPhone to focus on both lenses simultaineously?

Thanks
Focus for MultiCam
 
 
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