Ivan,
How close to the missing tile is that location?
Which direction should I fly to find the missing edge.
If you have a way to zip up the scenery and post it somewhere I could try to reproduce your problem and verify if it is the scenery or your installation.
One reason I asked this is to eliminate the possibility of a bad download. Just because I successfully downloaded the tiles doesn't mean you were successful. It's possible you didn't get a good download.
I got the tiles from "https://home.flightgear.org/download/scenery/" -> "http://ns334561.ip-5-196-65.eu/~fgscenery/WS2.0/scenery-2.0.1.html".
Did you try downloading it a second time?
I have the opposite problem you have. I removed my path to my world scenery and turned off terrasync and yet when I load in an area I know I have never been, somehow I have the scenery.
When I did have terrasync on it made a folder for the scenery it downloads to reside in. Even if you shut it off that folder and whatever scenery has already been downloaded remains available to the simulator (using the QT-launcher). So apparently I actually flew near that area at some point in time. Once I excluded the terrasync scenery folder I was able to load the e060n50 chunk, everything looks OK near the airport.
Kansas and Ohio/Midwest scenery development.
KEQA, 3AU, KRCP Airport Layout
Intel i7/GeForce RTX 2070/Max-Q