As you can see in the screenshot, I am trying to place a Cothon. The tooltip is telling me that the best place to build it is on the existing harbour but, the +7 food yield isn't accurate since the existing harbour is already exploiting the water tiles. 

It's not exactly a bug since the Cothon will actually provide the 7 food but, in fact, the city will not gain an additional 7 food. 

I also noticed this issue when trying to place multiple harbours on outposts. 

I know it's very minor, but I'm reporting here in case it's easy to fix.

There doesn't seem to be a lot of shallow area in that territory, so placing the Cothon elsewhere isn't going to increase your food-from-new-tile-yields.  On the other hand, building a new Cothon instead of replacing your harbour is going to get you a net -10 Stability, which with "district recommendations wizard" absolutely does factor into recommended placement.  In cases like this, where there isn't much extra food to be gained by exploiting new coastal waters, and where there aren't substantial bonuses (yet) for additional harbours*, replacing the existing with a Cothon is currently an optimal choice.

Other factors that might make it beneficial to place a Cothon near a harbrour instead of replacing it:

• Some infrastructure gives you a bonus per-harbour.  If you had Fishmongers and (Great) Fishmarkets, the boosts to harbours may tip in favour of building a new one instead of replacing with a Cothon.
• If that harbour was instead a Phoenician Haven, it may have enough good yields that the "wizard" may not recommend replacing it.
• Especially if you have bonus-per-quarter luxuries like Sage, Gemstones, Silk, etc, your emblematic harbours are going to have better yields and the "wizard" won't recommend replacing them.
• If you're the Medieval Swahili, all bets are off.  The stability bonus from adjacent harbours that "count as" other districts becomes enormous.

Aha, yes!  In that example, it definitely shows the problem better.  I think it's been a recent issue (since Bolivar, I think?) that harbours seem to no longer generate food for outposts.

I created a bug report for it here: https://www.games2gether.com/amplitude-studios/humankind/forums/215-bug-reports/threads/48925-pc-steam-v1-0-14-2758-harbours-not-providing-fims-to-outposts?page=1#post-359602 but I wonder if it's intentional or not.

Question for Devs (Question for @Daarkarrow?):   Should harbours provide food for outposts or not?  They haven't for a few months.  Was this change intentional?

RedSirus wrote:

Aha, yes!  In that example, it definitely shows the problem better.  I think it's been a recent issue (since Bolivar, I think?) that harbours seem to no longer generate food for outposts.

I created a bug report for it here: https://www.games2gether.com/amplitude-studios/humankind/forums/215-bug-reports/threads/48925-pc-steam-v1-0-14-2758-harbours-not-providing-fims-to-outposts?page=1#post-359602 but I wonder if it's intentional or not.

Question for Devs (Question for @Daarkarrow?):   Should harbours provide food for outposts or not?  They haven't for a few months.  Was this change intentional?

I will ask around, but always it will be better on bug reports if you can include a save file @Undernier . Thx for the report

Thanks!

Here is an even better example of the issue (as well as a save). 1 st screenshot, suggested best position (replacing the existing harbour with a presumed +10 food and +3 science that are not actual gains), 2nd screenshot potentially actual better location.

Carthaginians Turn 52 try to place a Cothon in Babylon.ctr

That's the thing though, as it is currently calculated in the tooltip, the 1st location (on the existing harbour) has a total yield of 29 (10+12+3+4), the second location has a total yield of 17 (8+12+3+4-10).

The problem is that the current calculation does not take into account the tiles that are already being worked by the city's existing harbour. 

The calculation should be instead: 

1st location: 16 (12+4) since placing the cothon there will not actually add 10 food and 3 science to the city as they're already part of the city's production. 

2nd location: 17 (8+12+3+4-10). 

so in theory, the suggested location should have been the 2nd one instead of the 1st.  

I'd add that, personally, I almost never take into account the -10 stability when placing production districts. When I look at this city, I'm looking to improve its yield as much as possible and the calculation I used in my mind was: 

1st location: +16

2nd location: +27

Aye, thanks.  As usual, you're giving good screenshots and I'm missing part of the point -- strange that it doesn't seem to be factoring in the existing exploitation.  I was assuming the math was correct and that the increased food was coming from the fact that a Cothon is also a Farmer's Quarter and that the boost to food may be coming from Sage, Animal Barns, and more.  I'm not fully sure what's going on there, but it does look like it's ignoring the exploitation?  When you hover over the existing harbour, does it show the coastal tiles going from 0 food to 1 food?