Set position to Image Point

I'm trying to set a sprite's position to a specific image point of another sprite that has the platform behavior. However, when I move the character (2nd sprite), the positioned object lags behind. Is this fixable or by design?

Interesting - I actually realized it was NOT set to the platform object, but the sprite that was pinned to the platform object. I added an image point (same position) on the platform object and changed the code, and now it works.

Any idea why it didn't work with a pinned sprite?