Randomly guessing seed phrases in Phantom and it actually imported someone’s wallet ???? What the hell?

I was typing completely random words into the 12-word recovery phrase in Phantom. At first it showed “Incorrect words”.
I changed only one word and tried again — it suddenly worked perfectly. Phantom accepted it, showed “We found 1 account” and imported the wallet.
Now I have full access to that account.
I know the mathematical probability of this happening is basically zero, so I’m pretty shocked. Has this ever happened to anyone else? Is there some bug in Phantom or did I just get extremely lucky?
Not touching the account obviously, just curious as hell.
Throwaway account.