The "/debug_tktedit" page:

Edit a ticket.  The ticket is identified by the name CGI parameter.
/tktedit is the official page.  The /debug_tktedit page does the same
thing except that it does not save the ticket change record when you
press submit - it instead prints the ticket change record at the top
of the page.  The /debug_tktedit page is intended to be used when
debugging ticket configurations.