I was one of the answerers to a question later migrated: Why do so many books indent all paragraphs except the first one in each chapter?
My answer had received a comment while still in its original location, and I responded to that comment. Later he deleted his comment and added another, leaving mine without context. I was going to delete it, but with the page in its new location, it doesn't seem possible. The ⊗ symbol for deletion, which normally appears when you hover over one of your comments, is not showing up.
I did not have an account on the target site at the time of migration, but my comment was not linked to my account (as my answer was) even after creating an account on the site.