Gazebo stops subscribing to a topic when I run gzclient

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I'm working with ROS1, Docker and Gazebo. When I run the robotic application and the simulation application using docker run and I enter in the container images, using the command

$ rostopic list

I can see that the topic /cmd_vel appears in both the images, and when I retrieve the information using

$ rostopic info cmd_vel

I obtain:

Type: geometry_msgs/Twist

Publishers:

• /rotate (http://a47864a79463:33019/)

Subscribers: None

and

Type: geometry_msgs/Twist

Publishers: None

Subscribers:

• /gazebo (http://225f2aebfbbd:41711/)

for the robotapp and the simapp respectively. The point is that, when inside the simapp image, I run the command

$ rosrun gazebo_ros gzclient

I obtain the following output:

the robot stands still inside the Gazebo GUI (instead rotating around the z axis with an angular velocity of 0.1 rad/s) and the /cmd_vel topic disappears from the ones available in the simapp image (together with others).

Do you know what could be the cause of this error?