Advertised services issue

Version 3.19.3.0 on a Rocket M5
This is a new installation with one link.  I installed MeshChat on the node itself and although it shows up in Mesh Status display:


It does not show up on the Services page:


until I add a dummy port forward entry:


If I then delete the dummy port forward, then the MeshChat service will disappear from the list of advertised services - and go back to the "none" display as shown in the previous screen capture..
This prevented me from changing the MeshChat Zone until I tried the dummy port forwarding entry.  So is this a bug or me not understanding what I'm trying to do?