@Jillinger Lol! Yeah there was a bug in this build which made “flow particles” disappear, which makes your confusion not that odd.
The later versions will have an animated material, as well as particles to show flow direction. And so far it works as expected! Still in testing as of now, may land on “dev channel” soon. Here’s some stuff I made using the alpha builds, will give you a better glimpse into the future!