Hmm. I guess as long as the answer summary highlights the total walking distance as well as the total overall distance, it'd be useful. Not technically a glitch, either, given the specific input parameters.

Should it still check the route vs the direct distance and add some commentary if there's a large discrepancy? Something along the lines of "This is quite a long total journey, but it has the shortest available walking component, as requested. You can adjust the maximum allowable total travel distance or time, if you like, by clicking [here]."?