We have look at the previous answer,
We do not use Vulkan (only OpenGLES2 or OpenGLES3).
We tick only the XR Plug-in we need to build the app =>
- Pico XR for the G2 4K Series
- Oculus for the quest 2
Even if we uncheck Oculus to build on the Pico, we have the black screen, but if we definitively remove the Oculus XR Plug-in it's working.
We do not use the Oculus SDK (Integration package).
Maybe the problem comes from the Oculus XR Plug-in, we will post a question on their forum.