Devices continue to be reported by `Adapter::peripherals()` after powering off

[andrewdavidmackenzie]

Describe the bug
Once a device is discovered, it is always returned in the list of devices from available_ble_devices even when it is powered off.

To Reproduce
Steps to reproduce:

1. Power on a meshtastic device
2. Run available_ble_devices in example or own app and print out the list of devices, in a loop
3. Power off the device

Expected behavior
The device will cease to be reported as one of the available btle devices.

Additional context
Macos Tahoe 26.2

If you stop the app/loop, and restart it. The powered off device will not be discovered, as you would expect.

This, together with the no-MAC-on-macos issue have given me a lot of issues and debugging.
Not sure where the core issue lies, in this crate or btleplug?

This is the code I have used to debug this:

            // loop scanning for devices
            loop {
                // start scanning for MeshTastic radios
                // TODO report an error if cannot scan
                let _ = central
                    .start_scan(ScanFilter {
                        services: vec![MSH_SERVICE],
                    })
                    .await;
                tokio::time::sleep(Duration::from_secs(4)).await;

                match central.peripherals().await {
                    Ok(peripherals) => {
                        let mut ble_devices_now: HashSet<String> = HashSet::new();

                        for peripheral in peripherals {
                            ble_devices_now.insert(
                                peripheral
                                    .properties()
                                    .await
                                    .unwrap()
                                    .unwrap()
                                    .local_name
                                    .unwrap(),
                            );
                        }

                        println!("Found: {:?}", ble_devices_now);
.....

I start the app running that code and it discovers my two devices and prints:
Found : {"Meshtastic_5171", "Meshtastic_47fd"}

I power off both devices, and it continues to report the same list of devices.

If I restart the app (with the devices powered off) they are not discovered.

[andrewdavidmackenzie]

Is it possible that it is working as intended?
Should I stop the scan after getting the list of peripherals, and start again to get the new list?
Any other suggestions to be able to detect devices that were discovered but are no longer present, using the provided API?
Thanks!