I have read through the other posts on trade routes being broken, but I haven't seen this particular issue described. It is reproducible 100% of the time, including after restarting the game.
I play this game as Kamehameha, just testing some things. One of the things I found was that a city state (Cape Town) requesting a road to the capital is not content with a road to a harbour city (Tahiti), even if there is a harbour in the capital. To verify this, I then built a road to connect the city state. The city state accept this road during its turn, but the road breaks all my sea trade routes (such as to Tonga and Aotearoa) ... which kinda sucks as Kamehameha ...
NOTE: Just out of the screenshot, south of Honolulu, is my second city Samoa. It is connected by road to Honolulu and it built a harbour before Honolulu, just in case this has any effect on the bug / calculation of trade routes. It sort of looks like it might have.
I reloaded an autosaved game and played until the turn before the road was finished, and removed a piece of the road between Tahiti and Cape Town before I finished the road from Honolulu to Tahiti. No connection to Cape Town, of course, but again all sea trade routes were broken at the start of next turn. I then bought a harbour in Hilo, which only had the effect of breaking the land trade route to Hilo as well.
I then tried to see if I could fix the problem after it appeared:
That pointed to Samoa being the issue.
I then tried to see if I could fix the issue before it appeared:
I can't say for sure, of course, but I doubt this is how it is supposed to work
I play this game as Kamehameha, just testing some things. One of the things I found was that a city state (Cape Town) requesting a road to the capital is not content with a road to a harbour city (Tahiti), even if there is a harbour in the capital. To verify this, I then built a road to connect the city state. The city state accept this road during its turn, but the road breaks all my sea trade routes (such as to Tonga and Aotearoa) ... which kinda sucks as Kamehameha ...
NOTE: Just out of the screenshot, south of Honolulu, is my second city Samoa. It is connected by road to Honolulu and it built a harbour before Honolulu, just in case this has any effect on the bug / calculation of trade routes. It sort of looks like it might have.
I reloaded an autosaved game and played until the turn before the road was finished, and removed a piece of the road between Tahiti and Cape Town before I finished the road from Honolulu to Tahiti. No connection to Cape Town, of course, but again all sea trade routes were broken at the start of next turn. I then bought a harbour in Hilo, which only had the effect of breaking the land trade route to Hilo as well.
I then tried to see if I could fix the problem after it appeared:
- I tried selling the harbours in Samoa and Tahiti, so I only had the harbour in Honolulu. It did not reopen my sea trade routes, but it did pop up messages that I now had trade routes to Samoa and Tahiti ...
- I tried selling all harbours on my starting island and bought a harbour in Honolulu during the same turn. No effect.
- I tried selling all harbours on my starting island, waited one turn, and then bought a harbour in Honolulu. No effect.
- The next turn (without reloading) I then bought a harbour in Samoa (where I also built my first harbour on the starting island). Bam! All sea trade routes reappeared.
That pointed to Samoa being the issue.
I then tried to see if I could fix the issue before it appeared:
- I reloaded and sold the harbour in Samoa before finishing the road. No effect.
- I reloaded once more and sold the harbours in Honolulu and Samoa, effectively cutting all sea trade routes to the capital. All sea trade routes stayed intact, due to the road to Tahiti - and thus a harbour - being finshed the same turn. Hm.
- Next turn (without reloading), I bought a harbour in Samoa, just to mess with the game. Nothing happened. Apparently all trade routes now go via Tahiti, and all is fine.
I can't say for sure, of course, but I doubt this is how it is supposed to work
