The create flow should still work, especially if nothing changed. If it doesn't, please file a bug
But if I don't delete the PVC, when I launch the template mysql-persistent-template again with the same name to use the same volume, this error appears:
Cannot create persistentvolumeclaims. persistentvolumeclaims "same-name" already exists.
Is there any way to launch an application named "Gandalf" from mysql-persistent-template, delete this application, and launch again the same application with the same name "Gandalf" for using the same PVC "Gandalf"?
Yes, you can re-use the same volume by not deleting the PVC. The lifecycle of a claim is independent of a pod's lifecycle. You can create and delete pods all day long using the same claim, but once you delete the claim, you are relinquishing your hold on that volume, hence it is Released.