ofn-engraving

[Ofnuts]

I think that what happens is that your path is so "dense" that you get only one layer. In other words, stroking the path with your minimal line width already male tje resulting image darker than the maximum darkness. Can you confirm by setting the Result to Keep layers and counting the layers that have been created?

Edit: problem and cause confirmed: fix uploaded soon, in the mean time, don't do that