Date Picker customfield does not work on Greenoppper Classic Planning/Task Board

Prerequisites

1. Customfield with type Date Picker configured in Jira
2. Date Picker type of customfield is configured for Classic Planning and Task Board to be displayed on Summary, List and Card view

How to reproduce

1. Go to Agile -> Classic Planning Board
2. Select Views -> Summaries
3. Press pencil icon after Date Picker field
4. Get following output:
5. Switch to Views -> Cards
6. Press again pencil icon after Date Picker field
7. Get following output:
8. Do the same for List view:
9. Switch to Classic Task Board and in all views get same results

Expected result:

1. Date Picker type of customfield values are editable in Classic Greenhopper views

Additional Information:

1. I know that your focus is on Rapid Boards, but I still see that this bug should be fixed.
2. Problem occurred when we migrated from Jira 4.4.4 & GH 5.8.6 to Jira 5.2.6 & GH 6.1.1
3. Also tested on another Jira 5.2.5 & GH 6.1.3.2 and got similar results
4. This bug should be reproducible on blank instance