Thanks for your reply. The spelling „ss“ is a easier way of spelling, indeed, but it is missspelled. In German „Strasse“ also has a differerent pronouncation than „Straße“. Sorry, but you should correct it, otherwise another user will be led to this error by of one of the OSM-QA-Tools. This tools recognize the difference between the streetname an the house. You would have to adjust the name of the street (please don’t do it!).
I do not understand the Problem of the mentioned Third-Party-System. Sure – „ß“ can bei a problem for english software. But it is a solvable problem: e.g. Nominatim has no problems searching with „ss“: https://nominatim.openstreetmap.org/ui/search.html?q=Norderstrasse+41%2C+Weener&accept-language=de%2Cen-US%2Cen