There’s the same issue if a post is edited and changes considerably.
If you quote one of my posts where I said
Obama is the best president ever!
And then I later edit it, after you quoted it, to say:
Bush is the best president ever!
Your quote does not change, and should not, yes?
In general oneboxes don’t “rebake” to reflect anything about the post or topic (or linked site) changing. They are baked once at the time of save and that’s it.