If I choose to drive on anything except the freeway, I get told the road is closed, drive it anyway (the road is, after all, not closed) and spend the entire journey with a mapless screen. Great 4G+ reception the whole way. Happens all over NSW. Weird.
Does it happen if you just use maps on the iPhone as normal instead of though car play? What iPhone are you using?
An X, and I have no trouble with it on city roads, I think it just has started doubting rural ones. Not shown is Google Maps doing exactly the same thing. I had downloaded maps, I didn’t need to, we were close enough to civilisation to have reception, but the gps insisted the road wasn’t there.
More and more rural roads seem to be dropping off the gps over the last six months.