```
% pandoc -f latex -t native --citeproc
\cite[„Etwas […{]} auslassen“]{key}
^D
[WARNING] Citeproc: citation key not found
[ Para
    [ Cite
        [ Citation
            { citationId = "key"
            , citationPrefix = []
            , citationSuffix =
                [ Str "\8222Etwas [\8230"
                , Span ( "" , [] , [] ) [ Str "]" ]
                , Str " auslassen\8220"
                ]
            , citationMode = NormalCitation
            , citationNoteNum = 0
            , citationHash = 0
            }
        ]
        [ Str "("
        , Strong [ Str "key?" ]
        , Str "\8222Etwas [\8230"
        , Span ( "" , [] , [] ) [ Str "]" ]
        , Str " auslassen\8220)"
        ]
    ]
]
```