Why does the same set of data files display normally in the HDRP project, but there are missing tiles and errors in the URP project

Why does the same set of data files display normally in the HDRP project, but there are missing tiles and errors in the URP project

I’m not aware of any reason for that. I’d suggest checking things like:

  1. Are you using the same version of Cesium for Unity in both cases?
  2. Are you certain you’re using the exact same tileset?
  3. Is the view different in the two applications such that a problematic tile is being loaded in one case, but not loaded in the other?