React version: 19.2

Steps To Reproduce

1. Add two (or more) components wrapped in Activity
2. Add a <title> component to each component wrapped in Activity
3. The browser title does not change if you switch an Activity from hidden to visible

Link to code example: https://github.com/nilshartmann/react-activity-title

The current behavior

• The last (?) rendered components sets the title with no respect to surrounding Activity
• In the screenshot below <Activity mode="visible"> renders a component that itself renders <title>two</title>, but actually the tab title is set to three (rendered by a <title>-component inside a child component of <Activity mode="hidden">)

The expected behavior

• Only the <title> in the <Activity mode="visible"> component should affect the browser title
• or it should be documented somewhere that the current behaviour is working as expected