Sometimes out of necessity the person filling out the LAR is also responsible for reviewing it. (Im now stuck in that boat). Although I don't think there is anything inherently wrong with it, I think it is incredibly risky to only have one level of control/review for something as high-risk as HMDA.
That being said, if I fat fingered something that caused an edit to come up I'm going to have to clear it either way. I don't think it is a conflict of interest. If you don't correct it, and no one else corrects the LAR you kind of have to correct the error.
The opinions expressed are mine, do not represent the opinions of my employer, and they are not to be taken as legal advice.