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In terms of move_base, you can only get a generic answer: Look at the outputs/rxconsole messages/log files/markers.

move_base only calls the global/local planner and usually that's the origin of failing. As their behavior is specific on the planner, debugging depends on what planner you use.

The fact that the global planner still publishes paths can be normal. It might not use real-world obstacles, or uses a relaxed plan (like only grid-based A*). So even, if that succeeds, the local planner might not be possible to find a path as you observed.