Thanks, that seems to be the case for me as well testing on openstreetmaps.org. In one case I tried openstreetmaps.org is returning two options (one of them being what I entered :/), so it seems like in that case DDG also just doesn't show a map tab.

(this reminds me why I never try to use OSM more than once every year or two; I hit too many cases too easily where it doesn't work; maybe I can just use DDG results to determine when OSM is worth trying :) ).