Unsubscribe Page shows wrong group names

Steps to reproduce -

1. Create a new mailing sending to a group where I was the sole member (mailing id = 1)
2. Send that mailing
3. Reuse the original mailing.
4. Change the recipient list from the original group to the name of the mailing created at step 1. Ensure the unsubscribe token is included.
5. Send the second mailing. (mailing id = 2)
6. Go to the unsubscribe link (see above).
7. All groups listed ... should have just been the original group name.

Note that this is only reproducible when mailing id created at step 5 doesn't matches with any "id" present in civicrm_group.

Eg. In the above case delete or update the id in civicrm_group of 1 and 2 to something else.