In https://github.com/precice/openfoam-adapter/tree/HH there is a draft of a case that I created to investigate a "kink" we could see when plotting a line across interfaces. Related issue: https://github.com/precice/openfoam-adapter/issues/93 It would be helpful to integrate this case in the tutorials already, so that the community can also help investigating this. I can eventually clean up and update the respective branch and transfer the case here.