Search along route is surprisingly hard to get right. Results near to the route geographically are not necessarily near in terms of disruption to your route (other side of a river, wrong side of a highway etc.)

To add to the "things are getting worse" narrative, we implemented this properly back in the days when sat navs were still relatively exciting things. Last I saw the algorithm was to do a lightweight route plan through nearby search results and find the ones that made the smallest difference to your arrival time at your final destination. I don't think the google maps search API does that yet, although I haven't worked in the area for quite a while.