Default 10-character iPhone password?

I've disabled "simple passcode" on my iPhone and have noticed that whenever I use the fingerprint scanner, with the keyboard up, a 10 digit passcode is automatically entered. My passcode is only 2 characters long and I've noticed the same on others' phones. Is there some sort of default password in-place of the fingerprint that serves as a backdoor?

1234567890
ABCDEFGHIJ!@#$%^&*()
0000000000 note: this password was used to launch nuclear missile in USA.

NoPassWord
YouAreFool
GodKnowIT!
*devil666*

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