yes it is a bug and i couldnt find what is causing it or how to fix it, it has nothing to do with the position because it was there no matter where i placed the platform, how i would try to get pass it is not really a specific move, but i right clicked and held and while holding right click i would just move my screen a little and jump while doing that. also it did take me a while to actually make sure it is possible so it IS possible and other wise i will try to find how to fix it, also you can beat it if you jump like right at the edge but thats all i can say