FluidSimulation with new Water in 4.26

I’m trying to use the FluidSim Blueprint for dynamic water effects with an actor, as demonstraed in the Water preview video. They added the exact same maps to the content in 4.26 (Fluidsim_terrain) but I just can’t get the forces to show. I created a blank project and started the respective map. Everything is there as in the demo, but the Impulse_BP or any other forces have no effect on the water. There are no errors, everything seems fine. I think I’m missing something here.
Any help is greatly appreciated!