I don't know UI principles, so just correct me if my argument is unfounded.
I would like links in modals (e.g. reviews) to open in a new tab. For example,
To me, the modal represents a transient view—a temporary popup for specifying details. I think links from these views, therefore, should also appear in transient views—i.e. as an opportunity to peer at the FAQ or other information related to the judgment. But the judgment itself shouldn't fall out of focus. For example, in the "off topic" pane, links to the migrateable sites do open in new tabs, which I like:
In the "duplicate" pane, it's mixed:
Is it that it's too messy to try to convert links for "pulled" content? But it doesn't appear to be an
iframe, so I don't see why that would be the case. (The question's title does open in a new tab, though.)
The suggested edits modal also has a link that doesn't open in a new tab: