Oculus quest 2 not showing game objects appearing on runtime.

Thank you for the reply. I would elaborate it a bit.  The whole scene contains a base terrain and the simulations animated at specific time interval. The base terrain was taken from a Digital elevation model (DEM) and the simulations were the terrain DEM plus flow height of the debris which changed with time. A custom script reads the DEMs and  imported them as 3D objects into unity and animated the simulations (two consecutive simulations appear at a time and when the next third one was added, the first one got destroyed.) The project was done in URP, hence I used shader graph to both the terrain and the simulations. For the terrain I used a triplanar mapping blended with normal vector to create a rocky slopes and grass horizontal. For the simulations, I used a complicated shader graph which included tiling and offset (UVs taken from flow velocity of the debris). I hope this will help somehow.