We are facing a situation where the C#/.NET driver fails to load documents from a query, due to one or more documents having fields with duplicate keys, as described in Mongodb allows multiple keys with the same name - Working with Data - MongoDB Developer Community Forums
I’ve also added a comment [CSHARP-2389] Find fails when a result document has duplicate element names - MongoDB Jira , but generally speaking is there are a tool or technique to help identify and fix such problematic documents?