I don’t think “update notes or any marketing material” qualifies for making this kind of change non-silent - if the update is pushed through the same channel as regular security updates, and doesn’t explicitly notify the user the behavior of the button has changed, that’s pretty silent.

Often for those kinds of updates software will show a special introduction screen, tutorial, or outright a prompt asking you to choose between the new and old behavior - but that’s software from people that care about the user having a good experience, and making such changes is a big deal for them.