Split-Tool: Resulting geometry is not topologically correct (border support points missing)

When using the Split-Tool, the resulting geometry does not generate correct topological support points along the boundary. In several cases, features that lie exactly on the plan boundary are not snapped or marked correctly.

In the screenshot, the highlighted points should all be red (indicating boundary-touching support points), but they appear as blue. This suggests that the split algorithm is not inserting the required nodes at intersections with the boundary geometry.

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Expected Behavior

  • All intersections between split lines and the plan boundary should create proper support points.
  • Features that touch the boundary should be classified consistently (red, in the current color scheme).
  • Result should be topologically valid and match XPlanung requirements.

Actual Behavior

  • Split output contains several incorrect points: missing boundary nodes, misclassified points (blue instead of red), or unsnapped intersections.
  • Resulting geometry is not topologically correct.