In copyEdgeNodes the nodes were copied to the wrong places of the send vector. The problem was that the full vector sendProcessNeighborHostAllNodes was used for copying instead of the shorter vector sendProcessNeighborHostAfterFtoC

Only copy send nodes which are not part of the reduced communication (for reduced comm after fine to coarse)

for debugging

used https://kitware.github.io/vtk-examples/site/VTKFileFormats/ as guide