New phone "stole" old phone's ID?

My old phone tried to swim so is currently unavailable. I install syncthing-fork on my new phone. Different ID (of course), similar config but slightly different. After a few days, syncthing on my new phone asks if I want to overwrite a folder that was only synced with my old phone… when trying to understand why, I realise that my new phone appears as my old phone on my other syncthing devices. Sure enough, I check my new phone and it has the old phone’s ID, with the old phone’s config

how is that possible?

could google/android have tried to be smart and get me the same config? (same google account) both where installed with f-droid

both are Redmi phones, but I didn’t connect to the MI account/cloud so it would be very strange

I didn’t sync my syncthing config

It’s not a big issue for me, I’ll fix it, but it is a very confusing and could be very problematic in some cases

I would also think that when reading what happened. Was the Google One / Backup to Google Drive feature enabled on your phone that died? Syncthing itself does not store your device ID (technically spoken private key stuff) anywhere outside of your phone.

I’ve never got to the point to test this scenario as I’m not using Google Drive backup at all.

Yes, that’s my best guess too. But I’m confused, it would be litterally the only app google was able to restore, everything else I had to reconfigure myself

Also why only after 5 days

Could there be a way for syncthing to detect that and at least notify the user?

yes, they probably asked if I wanted to sync back from my old phone, and I approved without paying much attention

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