Occlusion not working in ARDK 3

Include the following details (edit as applicable):

  • Issue category: Real-time Mapping-Depth
  • Device type & OS version: Android / iOS
  • Host machine & OS version: Mac / Windows
  • Issue Environment : On Device
  • ARDK version: 3.0.0
  • Unity version: 2021.3.21

Description of the issue:
While testing ARDK version 3 , occlusion is not working correctly. The app not occluding as expected.
Check out the attached screenshot of how AROcclusion Manager attached in hierarchy.

Please check if EventSystem is in the scene. There are many missing descriptions for ARDK3.