Even if there weren't issues around certain aspects of the review system one failed audit isn't going to cause you a problem.
The audits are designed to catch so-called "robo-reviewers" who automatically click the button that's going to get them one step closer to the badges you can earn by reviewing. These people will fail multiple audits and ...
This is indeed a bug, the answer shouldn't have appeared in the review queue (neither as an audit, nor as a regular review). The reason is that the question is locked, therefore it and its answers cannot be voted on or edited.
This is an old bug that resurfaced, I will let SE know about it.
Nothing will happen if you fail an audit (or two). If you repeatedly fail audits, you might find yourself (automatically) suspended from reviewing for a week. If, after your suspension you continue failing audits, you might find yourself suspended for a bit longer. Moderators also have the ability to suspend a user from reviewing, in case the automatic ...
taken for the review audit FAQ on MSO
What happens if I fail?
For most, nothing. You'll be given some guidance on why the post was inappropriate and what you could have done instead, and then allowed to continue reviewing.
Repeated failures, especially in short succession can lead to your review privileges being suspended for a week or longer, ...