Flow algorithms tend to handle this case (and other perfect cases too) more reasonably as they see a choke as a path with low carrying capacity and avoid it ahe

Flow algorithms tend to handle this case (and other perfect cases too) more reasonably as they see a choke as a path with low carrying capacity and avoid it ahead of time. (If you're smart and the required carrying capacity is related to size of unit ball.) The trouble is how to dynamically adjust weights. That is path following and reaction part which is quite outside the purview of path finding algorithms other than that they have to work in an online manner.