Cannot uncheck checkbox 'Primary location for this contact' once it's set

1 - Add New Individual

Mr. Foo Bar
Home [x] Primary location for this contact
email - foo@bar.com

2 - Save Foo Bar

3 - Edit Foo Bar

Add one more location
Work [x] Primary location for this contact
email - foobar@work.com

(when u check [x] for Work location, the [x] for Home is unselected)

Click Save.

4 - View Foo Bar
(still shows "Home" as primary location)

5 - Edit Foo Bar
(show's both Home and Work as primary locations.)