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It sounds good for stopping attackers, but if I am the real user and enter a bad password it is going to be pretty infuriating spending time troubleshooting the 2FA not working problem that doesn't actually exist. I suspect your service will get a reputation for completely unreliable 2FA which may have unintended consequences.

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This can be solved with an error message at the end with something like "You either provided an incorrect password or your 2FA code is incorrect. Check and try again". This still ensures that someone is not able to guess the correct password and reuse it somewhere else where 2FA may not be enabled.

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