This isn't a novel thing, as far as I can tell. A decade ago when I was working on routing of over-the-road trucking, our maps provider moved the entire United States a couple meters and it broke all our road restrictions.
The problem for us -- and likely for those in Australia now -- is that converting physical address descriptions and lat/long becomes a little more fraught. We described road restrictions as being "on the road that is found between X1,Y1 and X2,Y2." A separate layer would snap those X,Y coordinates to the road network and find the road between them. Before the move, that meant converting to "Highway 6 Southbound from milemarker 16 to milemarker 28"
But when you moved the world, X1,Y1 no longer landed on Highway 6, and instead snapped over to the frontage road. Your restriction now read as "Highway 6 Southbound, down to exit 21, around the corner to the frontage road, then down the frontage road". And your restriction that used to say "stay off this one section of road" now says "stay off the highway, the frontage road, and don't use this exit."