Is water system problem? (Unknown shadow issue)

I use Unreal version 4.26.2.

I asked a question on the answer hub, but I can’t find a solution.

Today I reproduced the same problem with WaterPlugin’s WaterTestMap.

Increasing the DistanceFieldShadowDistance(or Dynamic ShadowDistance MovableLight distance) for directional lights creates unknown shadows.

For reference, I set the DistanceFieldShadow distance to 80000.

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