Using an old map and it breaks with the 0.9, since Dry Rock Island is removed and the map relies on it heavily (for vegetation textures and trees - without it, it's just black). Can this be fixed? If yes, how so? Thanks.
Download DRI from repository, take the parts your map needs and include them in your map. Adjust all the texture/object paths to be matching their new location.
I think the move to .json from .cs is the issue. Since I am quite illiterate in all things .json at this time I might try to make changes to an old map and then save. Take the newly saved files and overwrite the old ones ( just like before). I believe the game is now automatically saving most older .cs files to .json. I'm as confused on this as anyone but it's worth a shot.