The bug was caused by an error in our validation routine. The error's been fixed, but any single-character collections that included the Moonkin before our patch will require you to tweak your collection.
How To Fix Your Collection:
- Go to Update My Collection.
- Scroll down to your excluded pets (at the very bottom).
- Find the Moonkin Hatchling you collected.
- Click the {re-include} link at right.
- FIXED!
An optional last step is to exclude the alternate version of the Moonkin Hatchling you're unable to collect. Some of you may already have done this. You can do this by clicking {exclude} next to the Moonkin you wish to exclude in your Wanted list, toward the top of the "Update My Collection" page.