The library duplicates feature is behaving as expected as per the change notes. It now applies a virtual library restriction to the marked rows, just like a duplicates search within a single library does.
So the search results are automatically limited by the virtual library indicator to a search of the books marked as duplicates. That means there is no need for a search query to be displayed, hence why it no longer shows marked:library_duplicate because that is exactly what the virtual library restriction is doing for you.
Switching virtual libraries will clear the marked books. So if you want to find all books not in that virtual library, you could apply your own temp marker to those books with a different name, clear the virtual library restriction, then do a "not marked:your_marker" search.
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