I'm trying to watch a collection, but whenever $changeStream is part of the pipeline, I get the following error:

Command failed (Location40602): $_internalChangeStreamOplogMatch is only valid as the first stage in a pipeline

It doesn't matter what I set $changeStream to, or if it's alone or with other stages in the pipeline, I always get this error. I tried both with Rust and Node.js and I get the same error. This is the Rust code I'm using:

let stream_pipeline = Some(doc! {
    "$changeStream" : {
        "fullDocument": "updateLookup"
{{    }}}
});
{{}}

let stream = collection.watch(stream_pipeline, None).await?;{}

I'm using the "mongodb" 2.3.1 crate, Rust 1.66.0, MongoDB server 6.0.3, on macOS 13.1, Apple M1 Pro CPU. For Node.js I used the "mongodb" 4.13.0 package with Node.js 16.14.2.