This question already has an answer here:
Approved Jun 17 at 11:07:
michaelb958 reviewed this Jun 17 at 11:06: Reject
This edit is incorrect or an attempt to reply to or comment on the existing post.
And that's all there was.
Viewing the post's revision history indicates the edit was actually approved. The Meta question I linked to dates from 2012, and indicates that whatever bug was responsible was fixed. (Also, that was a question, whereas this is an answer.) What's going on here?
Edit: This bug report provides a possible explanation - at time of writing, if the OP approves an edit after running out of suggested edit reviews, it doesn't show up on the edit's summary.