Hammers Overflow bug

[myclan]

As you could see from the save, there are 2 hammers left to finish my shrine, and my city production is 7, so actually it will cost 1 hammer to finish it (with Piety opener), the overflow hammers should be 6.

But, when I start to build a warrior next, I find the overflow hammers are 12, twice as what I expect, so it should be a bug?

 

[FeiLing]

7*2 due to piety = 14
-2 --> 12

This is how it worked ever since the game was released with all kind of production boosts (for e.g. wonder bonus from marble, policies etc).

Arguable it's an oversight, but since no one bothered to fix it until now most likely nobody ever will - especially since one might also argue it having become a feature by now (as hammer overflow micro is generally considered a skill).

 

[bc1]

Does it work the other way aroud, too (previous overflow not multiplied by piety when building temple) ?