I notice this too in a basic scene I have, though it’s the shadow of a small rectangular room. Setting the CSM distance to 50,000, with 4 cascades, 20% (0.2) transition region, and a moderate fadeout fraction results in shadows that are there for about half of a cascade. So I start close to the room, back off with the camera, and the shadows fade and dissolve as I get further. Then the next cascade pops in, and fades / dissolves as I get further…until at 50,000 the shadows disappear more abruptly. But at the point before they disappear abruptly, the shape of the shadows look choppy / odd-shaped just before being gone. It happens with CSM distributed closer to the camera and further from camera (exponent). What are the proper settings of CSM for this to not occur?
I know one other option is mesh distance fields combined with the global distance field. Do those result in whole shadows, even at farther distances?