Great to hear that you are willing to take a look at it.
I think any game in the industrial age or further will have instances of this dumb behaviour once you open the world builder to look for it. It might not happen that much in earlier ages before the world is covered in tile improvements.
My present game isn't in a sufficiently advanced stadium yet and I'm not a quick player so it won't get there any time soon either.
Have to agree with this....(and I've played only a handful of hours in the couple of weeks, so I won't have any examples to show either

)
Two other points on workers, both (hopefully) with merit, but neither as important, as RJ's illustration of "dumb behaviour"...
1) Early in the game, the ai doesn't seem to "pair" up its workers enough. I often see 2 seperate tiles being improved for the same city, by 2 individual workers. If they "pair" and improve one tile at a time, the city can use that tile earlier (especially beneficial with horses and copper, for examples).
2) IMO, the ai still builds far too many workers, period. You don't need to improve every tile for a size 10 city in the early medievel period, for example. If there is nothing else to do, then you (or the ai) has built too many workers (the hammers could have been used on something more useful). The ais also in this case, often suffer from unhealthiness, as they've chopped every forest in sight, in their hurry to improve presently "pointless" tiles.
Let's hope Bhuric can maybe come on with something, but its a tough ask, as a lot of worker behaviour (what to improve, what to leave, when to chop etc.), is down to the judgement of an experienced player....