If I delete a comment of mine, and then try to upvote a following comment, the upvote is rejected, with the message "You may only submit a comment vote every 5 seconds":
Apparently, my deletion of my own comment was considered a "comment vote".
Similarly, I have to wait five seconds between deleting my own comment and flagging as obsolete a following comment that refers to it.
I understand the rationale for enforcing a delay after comment upvoting or comment flagging, but I do not understand the delay after I delete my own comment. It seems more like an artifact of implementation than a policy. If so, it is a bug that should be fixed.