SourceTree is not honoring subtree Source Path / URL when defining a bitbucket source.

Steps undertaken:

Create a new subtree in SourceTree, and use bitbucket as the source.

• Bring up the Add/Link Subtree dialog, and click the Browse Hosted Projects button.
• Select a hosted repository from the list in the Hosted Repository Dialog.

At this stage, you are returned to the first dialog. My Source path is set to
https://email@idtgroup.com@bitbucket.org/...

This cannot be resolved (two @'s), and the repository type fails to be determined. I'm assuming that this is due to the details I supplied when I set SourceTree up initially.

• Change the Source Path / URL to;
  https://username@bitbucket.org/...

• Proceed through the dialog setting local relative path, hit OK.

• Select the new subtree and attempt to pull.

SourceTree recorded this error in the log, and hung with the pull dialog open, progress bar spinning.

2014-04-10T10:17:28: Could not determine repository from: 'https://email@idtgroup.com@bitbucket.org/idtgroup-dev/taa-interface-libraries.git', output was:
fatal: unable to access 'https://email@idtgroup.com@bitbucket.org/idtgroup-dev/taa-interface-libraries.git/': Could not resolve host: idtgroup.com@bitbucket.org

The Source Path / URL was definitely specified in the subtree dialog as

https://username@bitbucket.org/idtgroup-dev/taa-interface-libraries.git

not

https://email@idtgroup.com@bitbucket.org/idtgroup-dev/taa-interface-libraries.git

For further reference, more discussion is at https://answers.atlassian.com/questions/282022/subtree-pull-hangs-or-pulls-into-the-wrong-folder