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That is an error of the 2D Dijkstra heuristic in the underlying SBPL. You may see more information by using rxconsole and setting the output level to "Debug", or by starting the footstep_planner node in a separate terminal. I'll check with your map file as soon as I can.

Could you test setting the heuristic_type parameter to either EuclStepCostHeuristic or EuclideanHeuristic, to see if the map is working otherwise?

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