Map not loaded when using namespaces

[FiIipe]

I noticed that the map is not loaded on RVIZ when the navigation stack is launched with namespaces.

Bug report

Required Info:

• Operating System: Ubuntu 22.04
• ROS2 Version: Rolling
• Version or commit hash: Rolling
• DDS implementation: CycloneDDS

Steps to reproduce issue

source /opt/ros/rolling/setup.bash
export TURTLEBOT3_MODEL=waffle
export GAZEBO_MODEL_PATH=$GAZEBO_MODEL_PATH:/opt/ros/rolling/share/turtlebot3_gazebo/models
ros2 launch nav2_bringup tb3_simulation_launch.py headless:=False use_namespace:=True namespace:=robot_lindo

Expected behavior

RVIZ shall show the map

Actual behavior

RVIZ does not show the map

Additional information

On rviz_launch.py it's necessary to add ('/map', 'map'),

remappings=[('/map', 'map'),
            ('/tf', 'tf'),
            ('/tf_static', 'tf_static'),
            ('/goal_pose', 'goal_pose'),
            ('/clicked_point', 'clicked_point'),
            ('/initialpose', 'initialpose')])