Thank you for the feedback.
It looks similar to a known issue of EasyAR's ARCore wrapper on some devices. We will deliver fixes in later releases.
We are also on the halfway of connecting EasyAR to ARFoundation, which may provide better ARCore experience on Unity.
Meanwhile, you can change VIOCameraDeviceUnion.DeviceStrategy to EasyARMotionTrackerFirst or EasyARMotionTrackerOnly to use EasyAR motiontracker first on supported devices, this will make be behavior the same with motion tracking sample.