Скачать или смотреть Stylized Water Material by Rimaye - ue5.4 issue

Reproducing the Stylized Water Material tutorial by Rimaye, I'm running into an issue where the foam appears all over the water surface.

Trying to backtrack with his video at t=27:10 where enabling the "Distance Field" visualization your entire level turns very dark-gray and it shows black below the waterlevel, and at t=27:29 when you disable "Affect Distance Field Lighting" on the waterplane it visualizes grayscales.

In my case (ue5.4) trying a simular level (landscape + waterplane + rock-mesh) when enabling the "Distance Field" visualization it shows the level in bright-gray when below the water surface, and there is no change when toggling "Affect Distance Field Lighting". I'm confused, this this seems something very fundamental and toggling should have an effect.

Any ideas what's going on here?