Error while mapping: maps doesn't update and exploration stops

[cataclism]

Hi! I've tried to use your package to map this: turtlebot3_big_house.zip

The problem I'm encountering is that when I launch the explorer it stops in the middle of the first room saying that it has no more frontier points to explore.
The strange thing is that it goes in between an unknown area and the mapping is not working, namely it doesn't update the map.
(Ti ho mandato il video da allegare)

I'm working with ros2 Gazebo and I've launched Gazebo using: ros2 run turtlebot3_gazebo turtlebot3_big_house.launch.py

Nav2 using: ros2 run turtlebot3_navigation2 navigation2.launch.py use_sim_time:=True slam:=True

Then I launch the explorer using : ros2 launch explore_lite explore.launch.py

If you want I can send you the workspace I'm working with.