Slider handle doesn't intersect with the gaze

Hello,

Based on this repo https://github.com/qian256/ur5_unity. I am trying to get this working with some modifications. You can also see the issue in this repo .

I am unable to get the sliders move when I deploy it in the Hololens. I have a cursor that can gaze over the robot body but doesn't intersect on the slider bar or handle. I have tried most of the suggestions online including canvas to worldspace.

None of these https://answers.unity.com/questions/947234/unity-slider-wont-slide.html helped me.