Beginner problem with autotile bitmasks

Godot Version

3.5.3

Question

Hello!
I’m new to godot and autotiling. I have been trying to make this bitmap pattern work with 3x3 minimal and am stuck. My goal was to have the top tiles at the edge and the bottom tiles on the inside but the bottom ones won’t show up at all. I would be grateful if someone could tell me why exactly this does not work, so I could learn.
image