The depth of the viewing frustum seems to be the same in babylonjs csm,
I draw all the frustums,and result is
As can be seen from the figure, the frustum is not layered during the rendering process.
and If this stratification can be achieved, it should be correct
             
            
              
              
              
            
            
           
          
            
            
              The frustums are not layered that way in CSM, the camera frustum is subdivided like this:

See this link for more detail:
https://doc.babylonjs.com/features/featuresDeepDive/lights/shadows_csm#subdividing-the-frustum
             
            
              
              
              
            
            
           
          
            
            
              It was my negligence, I set the stabilizeizeCascades attribute