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Can't speak directly to what might be the reason for your lack of roads, but what is shown on HERE
map creator seems to have no bearing on what is released as Garmin's current map update.
The Mississippi Forensics Laboratory has been open for around five years or more along with the new roads to get to it. However the latest Garmin 2020.10 still does not show the roads. Or have the current place or the old crime lab in it's database, or at least I've not found it. I filed a map error report with Garmin about it over three updates ago. Here Map creator shows it and the new roads. Don't know how long Here has shown it though.
My nuvi's and drivesmart are also very happy to route me via along a route that crosses a river. The only problem is the bridge has not existed in over thirty years. Hadn't told them about this one yet. Sort of lost interest in keeping them advised. None of the map errors I've reported to them have ever been fixed. Though errors I've reported to Google Maps have sometimes been fixed the same day I reported to them with a thank you from Google for making them aware of it.
If you are talking about searches after pressing the "Where to" button, then press the part of the screen that says "searching near:" and then select a relevant option from the list. For me it's usually "My Destination" or "A Different City".
Then you should get quicker finds.
I did create a lot of "weeds"........ <<grin>> I just can't help myself, sometimes tangent paths are to irresistible for me.