Question Lighting doesn't update immediately, when changing Shadowcaster. (HDRP)

So I'm not very knowledgable about lighting, but this behaviour seems weird to me. I try creating a day-/night cycle and swap the Light.shadows from Soft to None between sun and moon. Weird thing is, the lighting updates in a wrong way, when swapping from sun to moon.

How it looks like:


How it's supposed to look like (updates correctly, once I move something in the scene):


Here's the code that's causing problems (called from OnValidate()).

Code (CSharp):

1.     private void DayTransition()
2.     {
3.         if (this.timeOfDay > 6 && this.timeOfDay <= 18)
4.         {
5.             if (this.moon.shadows != LightShadows.None)
6.             {
7.                 this.moon.shadows = LightShadows.None;
8.                 this.sun.shadows = LightShadows.Soft;
9.             }
10.         }
11.         else
12.         {
13.             if (this.sun.shadows != LightShadows.None)
14.             {
15.                 this.sun.shadows = LightShadows.None;
16.                 this.moon.shadows = LightShadows.Soft;
17.             }
18.         }
19.     }