If the fender is not punctured, it can only be leaking from the stem. I would press on that being warranty. It's a minor burst.
The leak is through a crack. By feel I can tell the crack started from within the fender and moved out to the outside of the fender where it broke through. At that point it made a pin hole leak. Hope this is considered splitting and hope it will be covered under warranty. Warranty only covers splitting and bursting.