Thread:Feedback/Stopping bad signatures?/Ningauble

I edited the title of this thread, adding the words "and other untraceable vandalism." Bearing in mind that I might have added something of a vandalistic nature in the same way, please note: This is not adequate for monitoring and managing vandalism.
 * The edit did not show up at Recent Changes.
 * The edit is not listed at my User Contributions.
 * The edit is not listed on Revision history of "Feedback." Ok, it would be a subpage; but:
 * The edit is not listed on Revision history of "Thread:Feedback/Stopping bad signatures?"
 * The edit is not listed on Revision history of "Thread:Feedback/Stopping bad signatures and other untraceable vandalism?"
 * The opening post of the thread is annotated "Edited by other users", and the edit is listed in the Thread History, twice, but if one drills down for details:
 * Under activity "Comment text edited" the diff does not show what changed: it shows the old version with the old title as if it were the current and only version.
 * Under activity "Edited subject" it shows the current version with the current title, and indicates that the title was changed, but does not show the difference.