sky color goes wrong when raining

After it rains for a while and the sky color stabilizes, I will notice distinct color breaks in the sky at y = 94.988247 and higher positions.
when jumping,it's obvious.Settings remain unchanged

<img width="1021" height="318" alt="Image" src="https://github.com/user-attachments/assets/64c4a0f7-43c3-432b-b078-c08d61bbb2ed" />