Duplicate entries with `@` characters in bson documents

[pkese]

Description

After upgrading to dotnet 6 & recent MongoDB driver, I'm getting my bson documents formatted incorrectly.

Repro steps

#!/usr/bin/env -S dotnet fsi

#r "nuget: MongoDB.Bson, 2.15.1"
#r "nuget: MongoDB.Bson.FSharp, 0.0.4-beta"

open MongoDB.Bson.FSharp

FSharpSerializer.Register()

let doc =
    toBson {|
        status = {| ``$eq`` = "completed" |}
        resource_ids = {| ``$exists`` = true; ``$ne`` = null; |}
    |}

printfn "%A" doc

Expected behavior

seq
  [resource_ids={ "$exists" : true, "$ne" : null };
   status={ "$eq" : "completed" }]

Actual behavior

seq
  [resource_ids@={ "$exists@" : true, "$ne@" : null, "$exists" : true, "$ne" : null };
   status@={ "$eq@" : "completed", "$eq" : "completed" };
   resource_ids={ "$exists@" : true, "$ne@" : null, "$exists" : true, "$ne" : null };
   status={ "$eq@" : "completed", "$eq" : "completed" }]

Known workarounds

None that I know.

Related information

• Operating system: Linux
• Branch: Ubuntu 21.10
• .NET Runtime, CoreCLR or Mono Version: dotnet --version -> 6.0.300
• Performance information, links to performance testing scripts: See .fsx script above

[pkese]

Nope. It's not newer release of dotnet or mongodb drivers.

The problem is F# interactive mode:
If I run the same code properly with a .fsproj file, then it works correctly.

I'm happy to have found a workaround, but I'll keep the ticket open in case you have time to look into this issue.