I am currently placing some asset blocks in my route, and I've noticed that each time I move the blue icon to another place and hit F2, it says 'there are no changes to save'.
It's annoying having to delete a tree, and then undo it just to get it to recognise a change to the route. I can't quite recall if TS2017 was like this, but is this a recent change/upgrade to the game?
Personally, I find it annoying.