In the flag review tab of the moderator tools when I uncollapse, that is expand an item and take an action, like flagging or casting a close vote on it, then it automatically collapses again. However the state of the collapse/uncollapse icon doesn't get updated.
I've taken some screenshots (with freehand circles, aw yea!).
This is how it looks after either flagging or casting a close vote on a question.
Here is a screenshot of the uncollapsed item.
It is nothing dramatic but I thought you should know.