Fullcalendar eventClick is missing ‘end’ property value in ‘eventclick’ event details

I am not sure why but when I click on a event and look at the ‘eventclick’ data it is missing the end value.

Here is the data I am binding to the calendar (dropped this out just before I initialize the calendar)

binding data

as you can see the ‘end’ property value is provided prebind

and here is the eventclick values I am getting (JSON.stringify)

event data

as you can see the ‘end’ property is missing I was able to pass the same value as ‘end2’ but I would really would prefer to just use ‘end’