GitHub’s commenter: and involves: qualifiers find issues where a user has left a comment.

"involves", remember that. It searches for issues where you are the author, assignee, or commenter:

involves:@me

For your own comments, use:

commenter:@me

Combine it with other qualifiers:

commenter:@me is:open
commenter:@me repo:owner/repository
commenter:@me label:bug