Deleting tag from registry deletes all tags with the same image

Steps to repro

• Create a docker image (you can docker pull docker for testing purposes)
• Tag this image with two different tags in your private registry namespace: docker tag docker registry.gitlab.com/your/project:test1, docker tag docker registry.gitlab.com/your/project:test2
• Push both tags to GitLab registry docker push registry.gitlab.com/your/project:test1, docker push registry.gitlab.com/your/project:test2
• Go to GitLab registry UI
• Delete either tag

What happens: both tags are deleted in GitLab registry

What should happen: only one should be deleted

I suspect that what's happening is that the delete button is deleting everything with the same image ID, rather than just deleting the tag.