Background highlight indicating selected item is missing in One Dark theme

When I use the One Dark theme, the background highlighting that usually indicates the selected item in modal windows is invisible.

For instance, when I select “Move To…” on a bullet, the modal to select a new parent bullet opens with a few suggestions — but I can’t see which one is selected! Ditto for the modal that opens for slash commands — I can’t see which command is currently selected.

Any help?