The fact is that the shadows that move (should move regardless of the fluctuation of the waves), they are static on the maelstrom.
On storm 2.8, they move, even if a complete calm is done. We have already discussed this topic with you. You said you don't know what the problem is.
People told us that this is a shader bug. Shaders do not move these shadows. If you look at the gifs above, you can clearly see that on MS these shadows are static, and on storm 2.8 they move.
What you showed in your video, there is no change there in order for it to work the way it should work.