Go Driver bsoncore.Array pipeline repro

main.go

package main

import (
	"context"

	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
)

const (
	uri = "mongodb://localhost:27017/?serverSelectionTimeoutMS=1000"
)

var (
	ctx = context.TODO()
)

func main() {
	client := setupClient()
	defer client.Disconnect(ctx)

	coll := client.Database("foo").Collection("bar")
	if err := coll.Drop(ctx); err != nil {
		panic(err)
	}

	// {"$match": {}}
	stage := bsoncore.NewDocumentBuilder().
		StartDocument("$match").
		FinishDocument().
		Build()
	pipeline := bsoncore.NewArrayBuilder().AppendDocument(stage).Build()
	if _, err := coll.Aggregate(ctx, pipeline); err != nil {
		panic(err)
	}
}

func setupClient() *mongo.Client {
	opts := options.Client().ApplyURI(uri)
	client, err := mongo.Connect(ctx, opts)
	if err != nil {
		panic(err)
	}
	return client
}