We have a Unity (2019.3.12F) app with Vuforia (9.0.12), in order to support ARCore (Vuforia packaged 1.10.0) as a fallback for devices not supported by Vuforia Fusion we have set Unity' Vuforia configuration to "REQUIRED" and toggled on "Include ARCore Library".
PROBLEM: When Track Device Pose is ON, Android and iOS devices have far worse quality of tracking Image Targets and Ground Plane across devices that support ARCore, ARKit, and Vuforia Fusion.
However we have found as a requirement for ARCore to work across wide range of Android Devices this is needed to facilitate ARCore fallback.
This is not ideal as the difference in quality is drastic.
attached for reference is two videos, the first with this issue shown. https://imgur.com/a/3QnYIk2