I looked for a place where the MusicBrainz documentation answers your question. The closest I came to is the Editor page. It doesn’t answer your question directly.
What should autoeditor abilities be used? The Editor page says, autoeditors “should always align themselves to the Code of Conduct”, should “take an objective point of view regarding the data they edit”, and should have “basic editing fundamentals [so] that they are able to edit outside their realm of expertise”. My practice as an Autoeditor is that when I am confident that I am making edits which are correct information, and conform to the guidelines, and which make the database better, I apply them using Autoeditor powers.
The corollary is that Autoeditors should not apply those powers when they are not certain they understand the editing rules for a situation, or when they aren’t sure they are being objective. (When they can’t hold to the Code of Conduct, they should just log off MusicBrainz for the day and find some other use for their time.) When I am uncertain, I turn off Autoeditor powers, make the edit, and let it go to a vote. I am usually careful to write an edit note which explains what I’m not confident about.
The Autoeditor page doesn’t say this, but one benefit to the project of Autoeditors using their powers is that it lets the database improve with less congestion in the voting queues. The voting requirement is a protection, against incompetent and malicious edits; but also a problem, frustrating editors who have to wait days to benefit from their productive edits, and taking time for voting from other editors.
But Autoeditors are human, and can be confident but wrong. In this case, what I encourage you to do is to add a note that edit, even though it is already approved. The system passes that note on to the Autoeditor. If your comment has merit, then I expect most Autoeditors will respond. If the response doesn’t persuade you, I expect most will do as @jesus2099 describes, and redo the edit with Autoeditor powers off, and let it go to a vote.