The term “one way platform” implies that there’s only a collision from one of the four basic directions, up, down, left, right. But the “one way” option on the Platform Effector 2D has collisions from every direction aside from below. I tried toying with side angle variance to no avail.
Am I missing something here? Did someone post a workaround and I just can’t find it?
Try using a EdgeCollider2D instead of the BoxCollider2D. It will remove the side Collision.
Same problem 
I even made a box collider on top of my One way collider so you can run thorugh it, but If you want to jump on top of it you have to hit the box collider howering above it first, that box collider will activate the “on way collider”… But its buggy and not as smooth as I want it to be 
So I did fix it by setting the Surface arc to only 100