(NOT A BUG) +2 Hammers on Water Tiles with Moai Statues

[IronCrown]

The new national wonder Moai Statues is supposed to add +1 hammer to every water tile of its city. I built it and it behaved as expected. Some time later though, the city's water tiles had +2 hammers. I couldn't find an explanation. I looked into the tech tree, but couldn't find anything that would increase production on water tiles.

I'm suspecting that the research of guilds caused this, as guilds increases workshop hammer output by one. If it's intended that water tile yield is also increased (which I don't believe), then this is undocumented.

This occurs only in the city with the Moai Statues, other coastal cities don't get hammers from water tiles.

I have no save, but below are two screenshots, the first showing the +1 hammer tiles and the second the miraculously 'improved' city.

 

[Gyathaar]

You are in golden ages.. when in golden age.. every tile that has atleast 1 hammer gains +1 hammer (same for commerce)

 

[xfactor99]

As per the top right hand corner, you were in the middle of a Golden Age

 

[IronCrown]

Uh... never knew that. Please close