I am not sure that I would agree. If not taken from the map, then from where? And why only to the end of the road?
Perhaps I should add that the reduced limit is recent, but I do not recall noticing the problem in the past; before the reduction.
I do not take the failure to report and display as being correct behaviour; but rather as an error. Which is why I was wondering how it might be rectified. Is there a setting that ignores low speed limits, and how can it be changed?