8.1.0 rc2 onMouseOver and onMouseEnter not working when mouse moves upwards

This looks like a bug. When we run our mouse over an component a pop up should appear.

It works when our mouse enters from the component from the left, right and above (mouse moving downwards). However, if our mouse enters the component from bottom (moving our mouse upwards) it does not trigger the pop up.

this is for envent onMouseOver and onMouseEnter.