Purged document is appeared in _all_docs

I have used below code to purge document from couchbase lite. After purge, Response for the http://localhost:3699/db/PQ0001 is {"status":404,"error":"not_found","reason":"missing"} that mean document has been removed from the db. But When I used http://localhost:PORT/db/_all_docs, I can see doc id PQ0001 in the response. Is it the expected behaviour?

    Document document = this.Database.GetDocument(documentId);

                    if (document != null)

No, that shouldn’t happen. Please file an issue on Github.