Drag/drop of the pivot grid 'Data' field does not allow dropping as expected

My users have uncovered some unusual behavior in the pivot grid component when they try to drag and drop fields and the 'Data' field. This happens in the grid itself. (I haven't tried it in the fields popup window)

I've attached an extremely basic application with a pivot grid. The only thing to note about this application is

1. OptionsDataField.Area = dfaColumn
2. OptionsView.RowTotalsLocation = rtlTree (this setting seems to affect the behavior)

Please run the app and try the following steps as closely as possible. I use the term 'Data' to mean the red captioned field representing the Data 1 and Data 2 fields.

Scenario A

1. Click on the 'Data' field and drag/drop it to the left of Field 3. This works as expected.
2. Click on the 'Data' field and drag/drop it back to the right of Field 3. This also works as expected
3. Click on Field 3 and (try to) drag/drop it to the right of the 'Data' field. The grid doesn't allow the field to be dropped even though steps 1 & 2 clearly demonstrate the arrangements of Field 3/Data and Data/Field 3 are both allowed.

Close and restart the application

Scenario B

1. Click on the 'Data' field and drag/drop it to the row area to the right of Field 2. This work as expected.
2. Click on the 'Data' field and (try to) drag/drop it in the row area between Field 1 and Field 2. The grid doesn't allow the data field to be drop here; but it ought to.
3. Click on Field 1 and drag/drop it to the filter area
4. Click on Field 2 and drag/drop it to the filter area
5. Click on Field 1 and drag/drop it to the right of the Data field (in the row area). Notice that the grid doesn't allow the field to be dropped to the left of the Data field.

Close and restart the application

Scenario C

The goal of this scenario is to get the fields arranged in the row area so that they are Field 1, 'Data', Field 2. It's not as simple as it sounds. There may be other solutions but the only way I've found to do it is these steps

1. Drag 'Data' to the row area
2. Drag Field 1 and Field 2 to the filter area
3. Drag Field 1 and Field 2 back to the row area so they are to the right of 'Data'
4. Drag 'Data' between Field 1 and Field 2

The point of this issue is that arranging the fields in the pivot grid should not be a puzzle for the end user. For example, if Field 1, Field 2 and 'Data' are all in the row area, the user should be able to drag/drop any of the 3 fields into any arrangement (e.g. Field 1, Data, Field 2; Field 2, Data, Field 1). It is too much to expect users to understand "tricks" about dragging fields to the filter area before moving them to where they want.

Hopefully you are able to follow the description above. If not, I will try to clarify.

Thank you for your help…
Andy