WaterBodyRiver Problem!

I have a question. I’ve created some rivers using WaterBodyRiver, and this system is very useful. But I’ve encountered a problem. I hope that the rivers I create will become obstacles, so that when the pawn character is automatically pathfinding, it will treat the created river as a roadblock and detour or walk along the river. How should I set this up? I’ve tried to set the collision in this system to pawn block, but the character can still enter the river.
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