Range with two custom inputs - pass ref with functional components?

[StuckInSprings]

Currently I'm seeing unexpected behaviour with react-day-picker when using a range with two inputs and a custom input.

Here's a codesandbox with an example of what I've been working with

The custom input doesn't show the calendar when it is clicked, since it's a functional component I'm unable to pass the ref to the component as is demonstrated in the examples using classed based react.