Erosion broken when lattice layer added

[RJT-tVFX]

Lattice layer causes erosion to behave incorrectly

If a lattice layer is added, and deformed (attached), then erosion with hydro erodes, and then fills back in the eroded areas

Lattice erode.zip
unzip, .blend files are not supported

[zachEastin]

This seem to happen regardless of the lattice modifier. I think this might just be a natural occurrence of the algorithm in that the sediment fills in when the crevice gets too large.
It does seem to continue to work well despite this odd flub as given more time those areas are eroded again.

I'm keeping this open though to look at for a future version