Magnetometer issue in IOS

I recent use expo-sensors in my iphone7
The Magnetometer value(x,y,z) would return 0 after the booting.
It need waiting 2~20 minutes this function would work.

I try Magnetometer.isAvailableAsync() function, it will return true.

Have any idea?

Thank you very much.

Hi! Could you share a snack that reproduces this?

Here is expo example:

when I use iphone after booting, The Magnetometer value return 0
It need waiting some times to get value

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