Correct. I just have a folder on my server called roadfix where I've done this to about 3 or 4 sections on vinewood. No idea why the MLO's do this but haven't had an issue with the copied roads. As long as you spend the time putting it in the exact same spot it should be, no one will ever know!
If you go into codewalker and find the section of road that disappears, then drag it under the map and make a copy for a new ymap and drag it into place - this is the roadfix