Optional "To" Date Field (validation) Fails if Date Labels are "Within"

I have a Date field with an optional To date.

Since the To date was not always applicable I set it to be "blank."

In the "Customize Date Parts" section I had set "Position of date part labels:" to "Within."

The problem is with the label set to "within," the form (apparently) sends the labels "-Year" "-Month" "-Day," and thus the form fails since those are not really dates.

The work-around is to set "Position of date part labels:" to either Above or None.

I am not exactly sure what Category to put this in: bug report, task, feature request, or support request, so I called it "task" thinking that at some point those with php skills I do not have can somehow fix it such that blank dates with their labels selected don't actually send those labels, but strip them out before sending the form; or perhaps on the server side such that if the labels are returned ("-Year" "-Month" etc…) they are ignored and blanks/null/no date are used.