tf2 - Do child frames share time stamps?

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I've created a simple cube using interactive markers which appears as you would expect in RVIZ. I then added a new frame where the z-axis oscillates (giving the impression of an up-down movement). I called this new frame moving_frame. The code for which is:

void frameCallback(const ros::TimerEvent& time){
    static uint32_t counter = 0;
    static tf2_ros::TransformBroadcaster br;

    geometry_msgs::TransformStamped t;

    t.header.stamp = ros::Time::now();
    t.header.frame_id = "base_link";
    t.child_frame_id = "moving_frame";

    t.transform.translation.x = 0.0;
    t.transform.translation.y = 0.0;
    t.transform.translation.z = sin(float(counter)/140.0);

    tf2::Quaternion q;
    q.setRPY(0, 0, 0);

    t.transform.rotation.x = q.x();
    t.transform.rotation.y = q.y();
    t.transform.rotation.z = q.z();
    t.transform.rotation.w = q.w();

    br.sendTransform(t);

    counter++;
}

However, when I change the frame_id of my interactive marker, the cube no longer appears in RVIZ. An extract of the code looks like so:

visualization_msgs::InteractiveMarker int_marker;

int_marker.header.frame_id = "moving_frame";

int_marker.pose.position.x = 2;
int_marker.pose.position.y = 2;
int_marker.pose.position.z = 0;

int_marker.scale = 1;

int_marker.header.stamp = ros::Time::now();
int_marker.name = "my_marker";

I managed to rectify this error by removing the time stamp from the interactive marker (more luck than knowledge). So I was wondering if when connecting to a child_frame are the time stamps shared? If so, why when I include a time stamp (like the code above), does it result in the cube no longer appearing?