There's an issue with the newly added Dirt Road and Stone Road in the way they join on to each-other.
There are multiple related issues here, I think. Firstly, if you build a line of Road blocks (in either horizontal direction), they render as stone/dirt bumps instead of a smooth road.
This can sort-of be solved by putting a two-wide row of Road blocks, but there are still holes along the middle.
Also, if you try and put Road blocks beside other solid blocks, (ie. in the join in the above screenshot) It will render as a big square cube block, if it's next to an object like dirt, stone or lumber. If you put it beside something like a Camas plant or a Tree, it will render like that block contains a path tile (as if it's trying to join on to it).