Thats correct I used a Border. Tested it with the same setup Wes used in this Tutorial:
It looks like the “Click Method: Precise Click” does not do what the Tooltip describes.
At Epic: Steps to reproduce my Images above but instead of Border using a new Widget with Button as root of the Widget and the overridable On Mouse Button Down instead the Border Binding I used.
Looks like button always has higher Priority over the overridable Event of the Widget.
Reproducable 100% no workaround possible unless using a different Button than left Mouse.