Can't select start time with Range mode

On first use of the picker, you can select a start time, and end time, as expected.

After selecting a date range, and then going back to select a new date range, there is no way to actually set the start time to anything but "12:00"

https://jsfiddle.net/tj2Lo4z7/143/

Environment

• flatpickr version used: 4.5.1
• Browser name and version: Chrome 67.0.3396.99
• OS and version: Win10