rx.window_event_listener sends event to wrong state

[tim-haselhoff]

Describe the bug
A clear and concise description of what the bug is.

rx.window_event_listener breaks when using on multiple pages.
Events seem to be sent to the first one registered.

To Reproduce
Steps to reproduce the behavior:

• Code/Link to Repo:

import reflex as rx
from rxconfig import config

class State(rx.State):
    """The app state."""

    val: int = 0

    @rx.event
    def on_key_down(self, event: str):
        """Handle key down events."""
        print(f"Key down: {event}")
        if event == "ArrowRight":
            self.val += 1
        elif event == "ArrowLeft":
            self.val -= 1

    @rx.event
    def navigate_to_second_page(self):
        """Navigate to the second page."""
        return rx.redirect("/second")


def index() -> rx.Component:
    # Welcome Page (Index)
    return rx.container(
        rx.text(State.val),
        rx.window_event_listener(on_key_down=State.on_key_down),
        rx.button("Go to second page", on_click=State.navigate_to_second_page),
    )


class StateTwo(rx.State):
    """The app state for the second page."""

    val: int = 0

    @rx.event
    def on_key_down(self, event: str):
        """Handle key down events."""
        print(f"Key down on second page: {event}")
        if event == "ArrowRight":
            self.val += 1
        elif event == "ArrowLeft":
            self.val -= 1

    @rx.event
    def navigate_to_index(self):
        """Navigate back to the index page."""
        return rx.redirect("/")


def second_page() -> rx.Component:
    # Second Page
    return rx.container(
        rx.text(StateTwo.val),
        rx.window_event_listener(on_key_down=StateTwo.on_key_down),
        rx.button("Go back to index", on_click=StateTwo.navigate_to_index),
    )


app = rx.App()
app.add_page(index)
app.add_page(second_page, route="/second")

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Specifics (please complete the following information):

• Python Version: 3.14.4
• Reflex Version: 0.9.1
• OS: Linux
• Browser (Optional): Chromium

Additional context
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[linear]

ENG-9465