I was going through this post's timeline: Is a clean install better than upgrading?
Looking at the events in the timeline is quite confusing TBH.
First, let's take a look at this event: https://askubuntu.com/posts/5466/timeline#review_669540
Zanna was not a moderator in 2017. She became a moderator in 2020. So, having the diamond in this case is a bit confusing but it's OK as all the reviewers voted to leave the question closed.
Let's take a look at the next event: https://askubuntu.com/posts/5466/timeline#review_833759
In this review, Zanna cast vote to reopen the question. But since majority of the reviewers voted to leave the question closed, the question was not reopened.
This will look confusing to someone new to the network as many know that moderator actions are final; so they would assume that the question should have been reopened because of Zanna's vote. Most of the people new to the site would not know when Zanna became a moderator, so things will look contradictory to them.
There are other reviews as well in the timeline in which Zanna has participated (but was not a mod back then).
So please remove the diamond from reviews which were done before becoming a moderator to avoid confusion.