Dear Gurobi support team,
I have noticed a strange behavior when solving a linear problem (simple DC power flow). The duals on one of the constraints (nodal power balance) look quite strange and don't represent the behavior I would expect (the duals I get are very large negative numbers). After quite some playing around I found out that switching the crossover parameter 'on' fixes the issue, but I still would be interested to understand why this affects the quality of the duals. I have created a minimal reproducible example (mps format) if you think this could help. I would really appreciate your help!
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