• Steam Client isn't started (At least not at this stage)
  1. Start the Dedicated Server (let it finish loading up)
  2. Start the HC (it'll start the steam client and require login)

Once the HC is loaded, look at the Server RPT and the entry appears - You'll notice the error:

File VAS\menu.hpp, line 53: '/VAS_Diag/controlsBackground/VAS_ContainerBG.x': Missing ';' at the end of line

If you don't run the HC that entry doesn't seem to appear.
Not sure if this will also occur to actual players connecting (haven't tried)