This behavior can be observed even on the main page of jQuery. When animating an element with the show() function, the overflow style with attribute 'hidden' is not removed upon the animation's completion. Such behavior is isolated to this provided animation function and is not seen in others such as the slide*() type.

This is an animation breaking bug as generated content will not be visible if it is overflow (a fairly common and desirable trait).

Fixing this from a user's standpoint requires removing or manually setting the element's overflow style attribute -- however doing so will break the JQuery animation.