• downshift version: 5.2.0
• node version: 10.19.0
• npm (or yarn) version: 6.13.4

What you did:

1. Open menu via toggle button
2. Move mouse outside of menu
3. Use keyboard to highlight an item (ie: press down arrow)
4. Click mouse (outside of menu)

What happened:

Highlighted item will get selected. I would expect that nothing would be selected and the menu would close (ie: similar to pressing ESC)

Reproduction repository:

https://codesandbox.io/s/usecombobox-usage-z1i9w