Cardboard stereo view mask does not fit into a Xiaomi with display aspect ratio greater than 2.1

[jaguardigital]

SPECIFIC ISSUE ENCOUNTERED

http://www.jaguar.com.co/web/unity_googlevr/unity_google_vr_unaligned_aspect_ratio%202.1.jpeg

The depicted issue in the JPG of the link above occurs in a Xiaomi mi8 with 1080x2280 screen resolution and 2.1111 aspect ratio. It doesn't happen in a normal 1.777 aspect ratio mobile 1920x1080 screen. As you can see, it shows aproximately 7% of the video image outside the stereo mask (3.5% on each side), and the white vertical mark unaligned.

It also occurs on a Xiaomi mi 9 with display size of 1080x2340 px

HARDWARE/SOFTWARE VERSIONS

• Unity: 2019.02.f1

• Google VR SDK for Unity: 1.18.4

• Device manufacturer, model, and O/S: Xiaomi Mi 8 Lite / Android 9 PKQ1.181007.001

• Device fingerprint: Xiaomi/platina/platina:9/PKQ1.181007.001/V10.3.5.0.PDTMIXM:user/release-keys

• Device display metrics: Physical size: 1080x2280 / Physical density: 440
  The command adb shell dumpsys display | grep mBaseDisplayInfo returns the error "'grep' is not recognized as an internal or external command", so I used "adb shell wm size" and "adb shell wm density"

• Google VR Services: ???
  The requested command: adb shell pm dump com.google.vr.vrcore | findstr /i "packages: versionName" returns the error "'findstr' is not recognized as an internal or external command,
  operable program or batch file".

• Viewer manufacturer & model: Xiaomi Mi 8 Lite / Xiaomi Mi 9

• Link to Unity project that reproduces the issue:
  The Unity project http://www.jaguar.com.co/web/unity_googlevr/baq360.zip
  The APK http://www.jaguar.com.co/web/unity_googlevr/baq360_aspect_ratio.apk

STEPS TO REPRODUCE THE ISSUE

Having previously added the "Cardboard" VR SDK at the "XR Settings" of Unity "Player Settings" I turn on the Cardboard mode through the code:
UnityEngine.XR.XRSettings.LoadDeviceByName("Cardboard");

The app is in spanish, you have to select first "Cardboard" and then "Galería de experiencias". After that it will happen with any of the first videos that appear on the list

Trying to correct it, when I change the "Aspect ratio mode" found at Unity "Player Settings" to "Custom", and assign the "Up to" value to 2.1 or any other float value, the Unity Console throws the following error:

C:\Users\USER\Documents\Unity\360app\Temp\gradleOut\build\intermediates\merged_manifests\release\AndroidManifest.xml:50: AAPT: error: '2,1' is incompatible with attribute maxAspectRatio (attr) float

WORKAROUNDS (IF ANY)

I exported the project to Android Studio, and changed manually the AndroidManifest.xml adding the parameters specified at https://developer.android.com/guide/practices/screens-distribution

<activity android:resizeableActivity="false">
<meta-data android:name="android.max_aspect" android:value="2.2" />

But it didn't solved the issue