Making a new base, flame altar no longer giving +5 comfort level
So finally getting around to making a new base from my starting area, I went up to the top of the Pillars of Creation and put down a flame altar and expanded that altar and built a base. In this new base, I made a wall and roof coverage for the flame altar which is outside my main building but I don't get the +5 comfort bonus. Inside the building I built I have Shelter, Warmth all ticked. If I put down a fireplace and a basic bed, my comfort is now +4 but if the flame altar was working it should be +9. So I have Sheltered, Warmth and Comfort level 4 all ticked.
As a test, I made another flame altar and put that inside my new building which is sheltered and warm but again I am not getting the +5 comfort from the flame altar.
Am I doing something dumb here or is my understanding of +5 from the flame altar wrong? I did a google about the latest patch and it seems that the +5 flame altar should still be working.
Appreciate any thoughts, thanks.