So far #MagicEarth seems least worst of the #navi apps to work with #AndroidAuto - although devs appear very cagey about exactly which version(s) of #OpenStreetMap they are using, and where they are getting their shop / business data from which makes correcting it a bit harder - I've still not heard anything about the spelling mistake I reported (other than an auto acknowledgement) and as its closed source they only have email as a contact method.
It seems to be OSM based but with proprietary datasets tacked on and "crumbs from the table" of their commercial projects (providing navi solutions to transport networks in Germany)
Even so its a better app than many paid ones, especially after #TomTom has become increasingly enshittified, and #CoMaps still lacks features..