Thanks a lot for your feedback.
The Advanced settings of the erosion simulation node provide you direct access to the low level parameters of the simulation.
They are not clamped, meaning that you get maximum freedom to test various combinations.
The downside is you can very easily make the simulation diverge, more or less rapidly.
This is what happens in your video: the time step becomes too high and the simulation diverges extremely quickly: on one frame you can see some spikes and on the next frames the terrain starts to be eaten. In fact the heights values become very high or very low and can reach +infinity or -infinity, making the terrain invisible.
We are currently working on the erosion simulation. We don't know yet if we will keep the Advanced settings. If we keep them, at least we will reduce the range of certain parameters to minimize the number of cases where the simulation diverges. We could lower the range enough so that the simulation would never diverge, but that would reduce the liberty of the user to try potentially interesting combinations, so that's not an easy decision to take.
