Cheat River Island has a gravel runway running diagonally across it!

What you describe can be caused by Navigraph's NavData updates. Because load order cannot be dictated in our sim, the best approach to this is to delete the following file:

USERNAME\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Community\navigraph-navdata-base\scenery\fs-base\scenery\0302\APX26180.bgl