Sunlight and Shadow Flickering/distant shadows in Large-Scale Landscapes – How to Fix?

I’m experiencing severe shadow and sunlight flickering in a large-scale landscape project. Shadows and sunlight randomly appear and disappear on mountains, landscapes, and foliage, especially during camera movement or when getting close to large objects.

What I’ve Tried:

Directional Light: Movable, increased Dynamic Shadow Distance MovableLight to 50,000, and added 4 cascades

Enabled Far Shadows and set Far Shadow Distance to 100,000

Commands tried
r.Shadow.DistanceScale 0

How can I stabilize cloud shadows and general shadows in large-scale dynamic lighting setups? especially on trees

check here video of what’s happening:

any idea anyone?