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When an edit review is pending, the notification window includes what appears to be a link to see Reviewer Stats.
On hovering, we can (barely) see that it's actually a button with a transparent background.
Same thing occurs after an item has completed review, where we can see the difference with a properly coloured button:
I assume this is a bug.
This is not a bug. It's an actual Stacks button style, so it's undoubtedly by-design. In fact, this is actually the default style for anything classed as a button. (You have to explicitly opt-in to either an outlined or filled style.) Whether it is sensible to have a button that doesn't look like a button except when you hover over it is debatable, like whether most of Stacks makes sense...
In this specific case, the design shouldn't have a button at all. This is a progressive disclosure idiom; it should use a flippy triangle or something that provides affordance to make the function clear. Unfortunately, Stacks strikes again; "Expandable" components use toggle-buttons (i.e., things that look like buttons, but visually preserve a "toggled" state) to control whether the item is expanded or not.
