The edit made quietly may leave earlier readers holding an account that is no longer visible.

Changing something after people have read it splits the record. Those who saw the first version carry it, act on it and repeat it, while anyone arriving later finds a page that never said such a thing. The quiet part is what does the damage, because it leaves the earlier readers looking mistaken about something they read accurately.

If you change anything others have already relied on, mark that it changed and say what it used to say. A single line of correction protects the people who were paying attention first.