The issue is that the collision volume itself for the PlatformCrackedRock is slightly too low, it isn’t above the platform at all so the character is never colliding with it. It must have gotten moved downward when you were messing with the sprite flipbook. If you move it up just a little bit, it’ll work perfectly.
As a note, it’s easy to miss these things when you’re focusing on something a lot. Feel free to come back with any more issues, sometimes you just need a second perspective.
Have a nice day