Why is the game telling me there is iron while there is not

Why is the game telling me there is iron while there is not - Brown Wooden Cubes

I searched for iron in the research bar and the game indicates me many tiles where supposedly there is iron.

However, as you can see there is not. In particular, the same thing happened on my territory, and I even destroyed what I had built on the tile (a farm) with the hope that I could make an iron mine later. But it didn't work.

Is that a bug?

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