To reproduce this bug:
- start segmentation of an image
- activate 3D interpolation
- activate "Show Position Nodes"
- deactivate interpolation again
... then the position nodes are still visible in the data manager
Bug was found with a windows compile of the release branch (releases/2018-04) in december 2019 (hash: 0f8a56ccc4bf07f86112f4b4c4e2ff1f733dd9d4).