I am using the iOS Strava app.
If a use a downloaded route map from my saved maps and start the route, I see the orange route line on my map… until I lose cell/mobile internet reception and then the orange route line disappears completely.
As soon as signal is restored it comes back.
Note that this is a downloaded route so I would expect the route data to be available without any internet connection.
I think this is a relatively recent regression as a year ago I never used to have this issue.
As a workaround if I hide the current activity and view the route in Maps > Saved > Saved routes, I DO see the orange route line and my position on it, even with no mobile reception.
This is currently a huge frustration. Im not sure whether this is a general issue or perhaps unique to some issue with my device, so if there is any way to fix it then I’d love to know.