Remote debug via USB on the “modern” device Xiaomi redmi note 7, on its bigger brother Xiaomi Mi Mix 2S works perfectly.
var invisibleMaterial = new BABYLON.StandardMaterial("invisiblemat", scene);
invisibleMaterial.backFaceCulling = false;
invisibleMaterial.indexOfRefraction = 1.0;
invisibleMaterial.refractionTexture = textureSource;
invisibleMaterial.refractionTexture.coordinatesMode = BABYLON.Texture.SKYBOX_MODE;
invisibleMaterial.invertRefractionY = false;
invisibleMaterial.diffuseColor = new BABYLON.Color3(0, 0, 0);
invisibleMaterial.specularColor = new BABYLON.Color3(0, 0, 0);