How to set Null to OOB Form in Workflow

Workflow sample attached, I was able to duplicate using EmailAddressEditForm2.    There are multiple forms that the client has seen this with and it appears they are doing things correctly within the code.    In CRM when using the EmailAddressEditForm2, you are able to change the Startdate back to null.  In workflow it doesn't recognize the null value as a change therefore causing it to not update the database.
I have looked and don't see any way to get around the Null date issue and it appears to be a bug within the workflow call to the out of the box form

Steps to Duplicate

Add XAML file to workflow project 
And run it 
Find a constituent that has a start date
Enter Null date into Workflow
Go to Constituent within CRM see that the date doesnt' change to Null
 

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