Gyroscope, Magnetometer, and Gravity All Return Zero Vector on Android

[cybereality]

Godot version:
3.1.2 Stable (Steam)
3.2 Beta 5

OS/device including version:
Amazon Kindle Fire 7
Lenovo Tab 4

Issue description:
These functions all return Vector3(0, 0, 0):

var grav = Input.get_gravity()
var mag = Input.get_magnetometer()
var gyro = Input.get_gyroscope()

This does still work:

var acc = Input.get_accelerometer()

Steps to reproduce:
Just place the above code in a project and export for Android (you can print the values)

Minimal reproduction project:
Download the "Sensors" demo from the Asset Library. It shows the problem perfectly.

[cybereality]

Actually, I tried some apps like CPU-Z and VR Checker, and it seems my devices don't have these sensors. On the Fire tablet it says it only has an accelerometer (no gyro, magnetometer, or compass) and on the Lenovo it says it has no sensors in VR Checker (but CPU-Z reads the accelerometer). Sorry for the confusion.