To complete Root's answer:
⚠ be aware that the last resolved comment won't be on the top of the list of this panel: comments seem to be sorted by date/hour of creation.
It would be nice to have an option to sort them by "last resolved/edited": if you think so, send this kind of feedback to google (in the menu help/report a problem. You can just copy past it). (Of course, google won't care, but you'd have tried)
in the comment history panel: add an option "last edited/resolved"
It's currently really difficult (if not impossible) to undo a comment
we just resolved since the comment aren't sorted by last
edited/resolved but by date of creation. So you need to know when the
comment was created (which isn't really possible) and then find a way
to retrieve it by reading and scrolling hundred of items, in this list
that takes forever to load every few items.