Hi!
I have tried to reproduce this problem on a desktop linux, using current version
https://github.com/navit-gps/navit/releases/tag/R6666 and version R5917. The latter, btw, almost 2 years old.
I was able to find lots of house numbers on the Indian Road of Toronto, Canada. I was using the latest map from maps.navit-project.org (tagged 160521). To do the search, I select the first item named Toronto in town search (the second one seems to be a tiny hamlet).
I guess, the problem may be related to the changes made to the code (letter M after revision number means it was modified before compilation). Also it may be related to low performance of Raspberry Pi. So maybe trying some smaller town and/or waiting longer would have some effect.
I do not have an RPi, so can not try it exactly in your environment.
Also there's alternative house number search method: after selecting a town, go to POIs, select the looking glass icon, then enter house number and partial street name and press the envelope icon. This is only a workaround, because it does not use house number interpolation and does not check town boundaries, but it might be useful to see what results do you get with it.
tryagain.