The GrapheneOS variant of Android will disable both Bluetooth and WiFi after a set period of inactivity.

There is also a Bluetooth shutoff app on F-Droid.

https://f-droid.org/en/packages/com.mystro256.autooffbluetoo...

I have also put an Airtag clone in my car (Loshall in iOS mode). That is probably leaking my arrival times. My water meter is also now bluetooth.