If somebody stumbles on this problem (as it’s still actual on 5.3.2), here is solution: you just need to change Brush Material from M_SimpleBrush to GenNoise_01 - it doesn’t appeared for me when I searched in dropdown by name, so just click browse to asset on M_SimpleBrush, and GenNoise_01 will be there in the same folder, drag it to brush material - and issue is solved! Found this solution on reddit in related topic (https://www.reddit.com/r/unrealengine/comments/zjezwg/messing_with_water_plugin_for_the_first_time_how/)
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