Mud,
I had the same question a few years ago, but couldn't find the thread. I think it may have been on the old 3A forum, which is long gone. I freaked out enough to add a small piece of tubing in this location, only to find I wasted my time.
You're good. There are slight differences on the bowl portion of these things. I've rebuilt several Carter WOs at this point, and only one has the short tube shown in the above photo.