Altitude is returning negative number on Android

[NhaPCS]

Describe the bug
I tried on some android devices, but the altitude value always return negative
{altitude: -19.600000381469727, speed: 0.26203107833862305, provider: fused, accuracy: 74.29199981689453, verticalAccuracy: 7.641275405883789, heading: 80.17876434326172, headingAccuracy: 45.0, satelliteNumber: null}

IOS is working good.

Tested on:

• Android, Samsung and Pixel 3

[xunreal75]

What should be the correct value for that unknown location?
Have you tested other apps with fused location.