Asset Selection Context Menu cannot move when opened from specific locations

Workaround:
Left-Click and hold
OR
Click within a different portion of the Asset Selection dropdown

The event bound to the dropdown button for the "Asset Selection Menu", as I've been calling it, is fired on Mouse Down and the event bound to choosing an option from that menu is fired on Mouse Up.
This creates a situation where if the "Asset Selection Menu" cannot fit vertically on the screen, it will have options that overlap the mouse's position on a normal click and actually yield two click events for the one perceived click action.

This issue isn't bound to UMG - it can be reproduced in multiple places so long as the window positioning is consistent.

1. Open any project
2. Create a new Widget Blueprint
3. Dock the Widget BP on the File Menu Bar beside the Level Editor Window
4. WIthin the Widget BP, add an Image to the canvas
5. Within the Image's Details Panel, scroll to the top of the stack
6. Position the mouse in the noted location
7. Click within the Asset Dropdown menu

Result:
"Save Asset As" dialogue pops up

Expected Result
Asset selection menu appears