Cannot drag (dnd addon) events from popup

Do you want to request a feature or report a bug?

Bug - Cannot drag events from the popup overlay when using the 'popup' prop

What's the current behavior?

When dragging an event from the '+ more' popup, the text is selected instead.

See gif in action:

Codesandbox: https://codesandbox.io/s/react-big-calendar-dnd-example-jd8q3

As you'll see in the sandbox above, the 'onDragStart' callback is fired, which seems to indicate the the DND addon's wrapper is at least partially working.

What's the expected behavior?

Event in popup is draggable like other events in the calendar.

---

Has anyone run into this before? I've searched through the existing issues for this repo and it seems like dnd from the popup is supposed to be working.