@Sarai-WMDE curious if you've noticed this before?

The video in the description shows two different situations in which this can happen:

• accidentally hovering over an option (because your cursor was placed in that area before you started typing into the search box)
• intentionally hovering over an option (in which case it still feels a bit unexpected to me)

There is a third scenario when this happens. Suggest you use copy and paste by mouse. Select a word anywhere and use the right mouse button to copy it. Then select the search input field with your left mouse button then click the right mouse button to open your browsers context menu to paste the copied word in the input field. Now, depending on your browsers context menu (depending on where the ''paste'' entry is), the mouse cursor is somewhere below the input field. If you type in some more characters or simply ''enter'' the item under the mouse cursor is selected.