As work progresses on a ticket, it is common for it to accumulate discussion between submitter, screeners, and patch developers. As this occurs, it is essential to edit the ticket description to stay up to date as a summary of the essential problem, solution approach, and patch. It should not be necessary to read the the full ticket history to evaluate the patch.
Patches may, over time, no longer apply to master. Screeners often update patches so they stay relevant (retaining attribution to the author), but you can do this work as well if you like.