The following issues are known when using dune-subgrid:
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LeafIntersectionIterator does not implement numerInNeighbor(), intersectionXxxLocal().
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Currently only grids with elements of a single geometry work as hostgrids.
Subgrid uses certain host grid features where you might not expect it. If a subgrid behaves strange this might be caused by bugs in the host grid you normally don't see. In this case you can define the macro SUBGRID_VERBOSE to get more output and use the subgrid method report() to check the subgrid indices.