Docker gitlab-runner image v15.0.1 is the same as image v15.0.0 (same digest hash, same image)


I just upgraded my gitlab-runner container to version v15.0.1, and in the gitlab page showing me informations about my runner I see that it is in version 15.0.0.
So i double checked and my container has well been created with image tagged v15.0.1
So i went into docker-hub, and i saw that the digest hash for the tag v15.0.1 is the same than the one for v15.0.0 (80fc903c5ed9).
Is that normal ?