Thanks @pranavbabbar for the tip to set the default branch.
About point 2 - c...

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Thanks @pranavbabbar for the tip to set the default branch.

About point 2 - comments added in code on reason to use this way, and this is copied from addressfield module. Mentioned the same in ticket description as well.

// If the form has been rebuilt via AJAX, use the form state values. // $form_state['values'] is empty because of #limit_validation_errors, so // $form_state['input'] needs to be used instead.

Let me know.

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