SpriteShape Corners are not displayed

I am playing around with SpriteShape. It is a great tool but there is something i cannot figure out and spend hours searching but none of the solutions i found worked.
Any ideas?

This is the top sprite. Which works fine

and this is the corner sprite that it is not displayed at all.

This is the spriteshape settings

and Spriteshape controller
6207783--681837--upload_2020-8-15_20-57-8.png

  1. Please use FullRect for Sprite Mode for sprites used in SpriteShapes.
  2. The following conditions must be met for a corner sprite to be used:
    a. Adjacent points should be in linear mode.
    b. The points should have the same height.
    c. Ideally sprites should have center pivot for proper usage of corners without artifacts.
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