Upgrading Phone sees Old and New phones as one Device

I’m upgrading my android mobile phone, and when I first configured the new phone from my google account, it installed the Home Assistant app and restored settings from my original phone. I still have my original phone active though, and the odd thing is, Home Assistant is seeing these two phones as one Device in the app Integration.

The Device manufacturer and model match the new phone.
In the App settings of each phone, I’ve changed the Device Name to be different, but the devices for the Integration react from both phones.

For example, the battery_state sensor will change to “charging” if either phone is plugged into a charger.

Is this behaviour intentional?

How can I split these and have them represented as separate devices?

You need to clear data and start fresh with the app that restored. It restored your old login token and needs a new one.