No XR-4 Varjo Controllers: Update Varjo Unity XR SDK to 3.6.0 or newer in your project or, if you cannot do that, open SteamVR tray when running your application.
SteamVR Tracker role ‘Held in hand (any)’ does not work with Unity Input System.
High Defination Render Pipeline
Some built-in post process effects cause foveation area to be visible.
Directional light flare causes foveation area to be visible with HDRI sky.
Universal Render Pipeline
Unity 6 onwards URP does not render correctly and is not recommended to be used. Caused by invalid camera stereo matrices.
Unity 2022 LTS onwards URP/Unlit masking materials do not work.
Post processing causes foveation area to be visible.