"Update a Group" Api Endpoint Does not update

I tried everything I could. I could not get my group to update. Update A Group
Steps to reproduction (using Fiddler2)

1. Set HTTP Method to PUT
2. Set url to https://api.bitbucket.org/1.0/groups/steinerd/test-2/ (which is a valid group, also attempted the email for account name)
3. Set the Authorization header to the base64 encoded username:password it expects
4. Set Content-Length header to 0 (and also tested with the correct byte size of the request data, same result)
5. Set Request body to name=New+Group+Test&permission=admin&auto_add=true (I also tried with %20 for spaces and no encoding, same results)

I know that PUT sends a 302 upon success by design... but for a handful of them it was forwarding off to the return URL but didn't actually change anything.