For all with scenery loading issues, here are some steps to try. Please do let me know if they work for you, or if you're still having issues.
Delete your Content.xml file at `%localappdata%\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache` *
At the same location, delete the contents of the `SceneryIndexes` folder.
Clear your rolling cache, or any manual cache you have of the area.
Ensure your scenery is installed into the correct location (Community folder)
* after doing this, if you use Navigraph navdata, you may need to re-run the Navigraph navdata downloader