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It seems that this behavior is implemented intentionally.

https://github.com/ros-planning/navigation/blob/jade-devel/base_local_planner/src/trajectory_planner.cpp#L864

But it is unclear the reasoning behind this and seems that code segment is there from more than 7 years and unchanged.

I think this behavior should be at least made configurable so users could choose whether to back up without considering obstacles or not.

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