Confusing terrain auto tiling

[back2lobby]

Godot Version

4.3 (stable)

Question

I am trying to learn the terrain auto tiling thing. I stumbled upon it while following the zelda game tutorial but It was a bit confusing. So, I decided to clear the concept first. I am trying to create 3 different shapes (just for learning).

As you can see in the image, 1st and 2nd shapes are being created exactly as they should be. But for the 3rd one, I was expecting it to use those 3 tiles whenever the tiles are in “L” shape because they are connected by corners and sides together. I have selected “Match Corner and Sides Mode” enabled. Probably, my base concept about terrain auto tiling is wrong. Any help clearing this confusion is appreciated.

[back2lobby]

Update: I tried marking the top right corner of the 3x1 tile and it started working perfectly. I am not sure how though, I was expecting the corners to work for diagonal tile matching only.

I guess I gotta look for how the corners matching work in auto tiling.