Rqt topic monitor does't show correct values

[deebot]

I am running turlesim node and publishing angular and linear velocities on /turtle1/cmd_vel topic to control the turtle.
I am publishing on the above mentioned topic using a publisher written in python and also using static publishing using terminal. The rqt topic monitor only shows values from one publisher.
However when I echo the topic it shows the correct values.

How to reproduce the issue.

• Terminal1: Open rqt

  $ rqt

• Terminal2: Run turtlesim node

  $ ros2 run turtlesim turtlesim_node

• Terminal3: First publisher will publish on /turtle1/cmd_vel . The code is publishing following values
  msg.linear.x = -2.0
  msg.linear.y = -2.0
  msg.linear.z =0.0
  msg.angular.x = 0.0
  msg.angular.y = 2.0
  msg.angular.z = 1.0
  Grab the publisher code from here build it and run it using the command below.
  $ ros2 run my_py_pkg turtle_twist

• Terminal4: Run another publisher which will also publish on the /turtle1/cmd_vel topic.

  $ ros2 topic pub /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 4.0,y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 1.0}}"

• Terminal 5: Run echo command to monitor the topic.

  $ ros2 topic echo /turtle1/cmd_vel

Observation
The rqt only shows values from one of the publisher. However echo command shows the values alternating from both the publishers.

May be there is need to update the rqt code to handle situation when two publishers are publishing to a same topic.