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Gazebo 9 + ROS, /odom topic timestamp is not being updated

Hello, I have a strange issue. I am using differential_drive_controller plugin (<plugin name="differential_drive_controller" filename="libgazebo_ros_diff_drive.so">) to simulate a ROS robot in gazebo. I am under Kinetic, with the standard gazebo version (7) everything works well, but when using gazebo 9, the timestamp of the odom message generated by the gazebo differential_drive_controller plugin is not being updated (and also the tf broadcast timestamp). I don't know if the bug is specific to gazebo 9 or to gazebo 9 + ros melodic. Any clue? Maybe the question should go to ROS answer?