Stillwater surfing

I'm able to start surfing on still water (Terrain tag 6), unless I'm facing up.


The red arrows are the side I can't surf onto the water from. Any other side works fine.

I've looked at the example maps, and I still can't figure out why I can't surf on this map, but I can in the examples. I'm using the same tileset as the example maps. To be specific, I'm using Route 2 as comparison.

Which tile is that? There's multiple version's of the tile, some of them are used as a mountain edge, the others are used for a water's edge.

It's the one that's selected, which is the same one used in the examples

In layer 3 there is an invisible tile over those tiles (scroll up just a bit in the tileset and you'll see one labelled "Free pass"). This overrides the passability of that clifftop tile, and allows the player to surf north off it or walk north onto a bridge from it.