Push Notification From Instance Not Logged Into on Mobile Companion

Hello,

I recently setup a Development instance of my Home Assistant, where I did a restore from backup. I then disconnected it from Nabu Casa. I have never logged into this instance on my phone, and it is able to send push notifications to my device. I am using the Notify service.

The instances have different IP’s and DNS entries internally/externally for each instance.

This also occurs on just cellular/out-of-band.

How is this possible/how do I stop this from occurring without having to block the Dev instance’s internet?

I think I understand what is happening. I am using Notifications via Google, so during restore that old information was restored as well, so the notification are still able to be processed through Google.