Pie Chart Callouts Remain After Updating DataProvider

I have a Pie Chart with an Array Collection as the
dataProvider. When I update the dataProvider, however, the Pie
Chart callouts are not always displayed correctly. I basically have
a form where a user can enter percentages of catregories, and the
percentages are displayed in a pie chart right next to the form.
When I update a value from zero to some positive number, the
category is displayed in the pie chart correctly. But, when I
update that value back to zero, the callout labels get funkified.
For instance, sometimes one label is displayed twice, or if there
is only one category filling the pie chart (100%), the previous
callout labels are still displayed. I debugged and found that the
underlying ArrayCollection values are correct, but it seems the
series is not reflecting the values in the Collection. Any ideas
how I can fix this?
Thanks.

Sure! Here you go. Simply edit any of the "value" values to
be zero, and you will see what I'm talking about. Do it multiple
times and it gets worse and worse. I'm using SDK 3.2.
I'm starting to think this is a bug.

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<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
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<mx:Script>
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import mx.events.CollectionEventKind;
import mx.events.CollectionEvent;
import flash.utils.getTimer;
import mx.events.PropertyChangeEvent;
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[ { "name":"record A", "mydata": 30 },
{ "name":"record B", "mydata": 60 },
{ "name":"record C", "mydata": 70 },
{ "name":"record D", "mydata": 80 },
{ "name":"record E", "mydata": 40 },
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</mx:DataGrid>
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The following screenshot is for your reference:
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Pie Chart Callouts Remain After Updating DataProvider

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