CSM has artifacts if shadow distance less than 2000

1.Create a project from ThirdPersonTemplate.

2.Select the Directional light and set it to movable.

3.Set the Dynamic Shadow Distance MovableLight to 2000.

4.Drag a Sphere mesh to scene.

It also can be seen on some old IOS devices(such as Iphone6s, Iphone7），but newer devices are much better.

I tried to fix it, and the shelve is 6925243.

Before

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Fix

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