[Unreal Engine 4.16 x WWise 2016.2.5.6121] AkComponent still use RaycastSingle when Occlusion Refresh Interval is 0

Question

Hi, I am doing optimization for our game, and I notice that AkComponent use RaycastSingle have a pretty amount of impact on max frame time.

Since our game is in a open environment, I try to disable occlusion by setting Occlusion Refresh Interval to 0.

But I can still see AkComponent using RaycastSingle after I disable occlusion.

I wonder whether I can completely disable AkComponent to use RaycastSingle? Or is it fixed in latest version? (currently using WWise 2016.2.5.6121)

Thank you.