So, the afternoon/evening of November 24, 2019, I was driving, my wife was navigating, and my mom and step-dad were in the back of the rental car, driving from Turin to Genoa on the A6. Unbeknownst to us, there was a major bridge collapse on the A6 between Turin and Genoa. (Edit: I originally thought it was the August 2018 collapse in roughly the same area.)
Google Maps seemed to kind of know there was a problem, and kind of not know... it got us in a loop of getting on and off of the freeway, literally in a loop. So, I just decided there must be a problem ahead, and went a bit further along the detour it kept starting us on, and it eventually found us a proper detour. It's very strange that Google Maps routing heuristics put us on the detour when we were on the freeway, and re-routed us to the freeway as soon as we got on the detour.
We looped twice while I was weighing the relative merits of forcing Google Maps to bring us further down the freeway vs. forcing Google Maps to bring us further down the detour, and exactly the best way to accomplish that.
On a side note, don't drive in Italy, particularly with a navigator with aphantasia who isn't used to GPS lag, particularly in downtown Rome. We came very close to accidentally entering restricted traffic zones during restricted times, and narrowly avoided large fines, in both Rome and Florence.