I have managed to finally get hold of the Freighter Fuel recipes! Thanks for all the suggestions, advice and thoughts everyone. I’m still not 100% sure what I did to get them but what I did do was try several different things.
Deleted all my Fleet Command Rooms and rebuilt them. Then visited the Navigator NPC.
Abandoned any missions I could and then visited the Navigator NPC.
I discovered that when you build enough rooms and delete one at a time, the chosen Fleet Mission Icon pops-up and moves about the freighter, to attach itself to the ‘most recent’ Fleet Command room. I did not realise that.
So I had probably missed the icon as it was around the corner. By then of course I had given up and set focus to something other that a fleet mission. That may have been the misleading ‘bug’. So not really a bug. I didn’t think to look beyond the first room I had built believing I had to do something else to trigger the fuel recipes.
Perhaps any mission fleet room that needs our attention could have two warning bulbs light up on the exterior door. Like a news room ‘On Air’ sign. Except ours might simply be coloured blue (off) and red/orange (operational). It could even be a thin hazard strip light that edges the entrance, that changes colour.
There might even be an accompanying sound, when close to a functioning fleet room, that hints things are ‘going on’ when standing close to the entrance.