Yes this is a spurious warning that shouldn't prevent you from running the bridge. Apparently this field is used only by roscpp but not rospy in ROS1. The bridge doesn't need them to work so we removed the checking of these fields recently (see
https://github.com/ros2/ros1_bridge/pull/91).
This patch has been released in beta 3 so updating your code to the latest version should make these warnings disappear.
Hope this helps
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