Can't click a Dropdown outside of a Scrollview

I have a Dropdown inside a Scrollview, and if the dropdown options extend beyond the edges of the scrollview, they aren't clickable.
View attachment 173857
As you can see, I'm hovering the mouse over Option F, but Option D is still highlighted - nothing beyond the scrollview area gets any mouse input. I've a feeling that changing something about the 'Template' item of the dropdown might help, but I've tried everything there I can think of, the best I can do is to make the...

Can't click a Dropdown outside of a Scrollview