Shadows casted from translucent materials disappear after baking lights


after setting a translucent material and setting objects to cast volumetric translucent shadow and directional light to cast translucent shadows, I bake the lights and the shadows disappear…so the only solution is to leave those as movable objects, is this the way to do it?

also the shadows are not good enough:

any ideas on how to improve quality?
obviously, increasing lightmap of the ground or the boxes has no effect, the boxes are movable
Cascade shadow map options in directional light or distance field resolution mesh on object have no effect

note: I noticed that the resolution changes with the distance of the camera, so probably there is a command to improve quality, does anyone know wich one it is?

thank you