In Australia Google maps has issues with routing cyclists on 80km busy truck transit roads that have no bike lanes, footpaths or shoulders. You’ll regularly get stuck behind lost uber eats cyclists whose map took them through a motor vehicle only underpass.
The other day google maps decided to reroute me from a quiet, wide street with no bike lane that was otherwise perfectly safe, and tried to send me through a nightsoil alley, down a heritage stock run that was paved with cobblestones and crossed over a storm drain 4 times in a zig zag.
Yeah, “safer” because there’s no cars I guess, but not suitable for bikes at all.