Auto Tiling Issue

Hello guys,


i replaced my 1x1-tile with a sliced version (which has black bounds around it).
After (hopefully) correctly setting up the sprite, I apply it on my object, but the boxCollider2D won’t apply collision on the up- and bottom-tile.


Any idea, how to solve this problem?
Thanks in Advance!


Pictures:

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apparently a polygonCollider2D can fix the issue… is there another way with the box collider?