My attention has once again moved somewhat towards WBC3, and after making a new map with my latest Flooded Caverns tile pack, I noticed more official tiles that don't transition correctly.
Below is a list of all known official tiles that require tweaking in order to transition correctly. Like with the Unit Discrepancies thread, this will likely be my to-do list.
1. Some marsh tiles still don't line up correctly.
2. Some High-Grass walls. If I remember correctly then just the end parts.
3. Rock coast "fords" and maybe the corner tiles.
4. Large rock features - more specifically the mini volcano.