Unable to purchase a third ring tile for a city

[Bezurn]

I was trying to buy some stone on the third ring of one of my cities. There are no other cities that are trying to expand their culture to it. When I go to the city screen and click buy tile, the one which I should be able to purchase is greyed out.

Here are some screenshots for documentation.
This is a brand new game started after the hotfix.

Spoiler Screenshots :

 

[FeiLing]

In strategic view it looks like the stone tile somehow belongs to China (maybe that info helps in tracking down what went wrong here).

 

[Bezurn]

But China isn't even in this game What you see there is actually the highlight of my worker selection box.

Here's the savefile - I tried loading and trying again but no avail, will have to wait for my stubborn culture to go get a really good tile

 

[Petek]

You can buy the stone tile if you first buy the coast tile to the immediate SW of the stone.

Has anyone ever worked out the mechanics of tile purchasing? I looked at several save games and couldn't see a pattern. The tile-to-be-purchased has to be contiguous to at least one tile that's already within your borders. However, that condition is necessary but not sufficient.

 

[Bezurn]

Ah thank you. I played on without buying it, took over 100 turns before I was able to acquire that tile My capital actually ended up snagging it.

I think that was the problem all along. My capital had snagged those horses before Brasillia was founded. So since the horse tile 'belonged' to the capital (even though it was in the 4th ring from it) the purchase tile mechanic for Brasillia wasn't aware that it owned the horse tile, and so it would buy the stone because its borders had not extended out that far.

It shouldn't be that way though. If a tile is owned by your empire then the city shouldn't care which city acquired that tile for purposes of buying tiles so long as they are adjacent to your borders and within 3 hexes of a city you own.

 

[FeiLing]

It shouldn't be that way though. If a tile is owned by your empire then the city shouldn't care which city acquired that tile for purposes of buying tiles so long as they are adjacent to your borders and within 3 hexes of a city you own.

Now if someone conquered your city then if it was like you say it should be, there would be the tiles your capital acquired in between the Brasilia tiles. So it does make sense actually to work like it does at the moment