Understanding opacity in hidden revisions

I noticed that when a revision is hidden, different levels of opacity are added.
First, opacity is added to the previous version. This makes sense to me as an indicator that it is no longer visible to other users.

However, opacity is also added to the heading of the topic on the right-hand side, but not to the content. I don’t understand this. I’d expect it to either be added to both elements or none. Is this intentional?

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