Problems with Terrain editor after 0.4.1.2 update

I was working on a level before the latest update, and all the changes i had made on the terrain was gone when I installed the update, and ran the game afterwards.
Should I delete some cache-folders or something?

The version the game loaded was a version from before the latest changes, maybe a few weeks old.

 

Anyone know why? It's like two weeks of work down the drain :/

 

Looks like I found the recently updated .mis and .ter files that were removed from the terrain folder, and replaced with versions from february 2014.

They were in this folder: My Documents\BeamNG.drive\backups\version.pre.0.4.1.2\levels\Leap-Of-Death

Why were they replaced with old versions?
Any devs like to comment? and will the game do this every time there's a new update?