Dealing with this too, is there really just no solution for this? I know it’s an experimental feature, but I figured an issue that renders the whole niagara fluids system (or at least the 3D portion of it) essentially unusable outside of being a neat editor gimmick would be kind of important to solve.
(Edit: I’m not sure exactly what did it, but I solved it by changing the mesh renderer back to particle instead of emitter, turning on heterogeneous volumes in the project settings as well as the emitter itself, and setting the volume renderer’s render visibility to 1. Idk which one specifically did the job, but it seems to work for me.)