Success and cancel URL are lost when jumping to Tumblr app with no user logged in

[adammlevy]

Using the following Tumblr API method

[TMTumblrAppClient createLinkPost:_articleTitle URLString:_articleURL description:_articleSummary tags:_articleTags success:_successURL cancel:_cancelURL];

As soon as the Tumblr app is launched, if no user is logged in then the successURL and cancelURL is lost.

If I launch the Tumblr app with this API method and no user is logged in then I would expect two things

1. Tapping cancel before logging in should jump back to the originating app
2. After logging in I should be immediately brought to the post screen