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Updating array element by index adds new property to all elements with index as part of the property name

Let's assume we have this structure:

{
  "foos": [{
    "bar": "value 1"
  }, {
    "bar": "value 2"
  }]
}

If we want to change "value 2" to "value 3", we can update in mongo console:

.updateOne({_id: new ObjectId("***")}, {"$set": {"foos.1.bar":"value3"}});

It works perfectly. But if I do the same thing in golang:

.UpdateOne(ctx, bson.M{"_id": someID}, bson.A{
		bson.M{
			"$set": bson.M{
				"foos.1.bar":"value 3",
			},
		},
	})

This will result:

{
  "foos": [{
    "bar": "value 1",
    "1": {"bar": "value 3"}
  }, {
    "bar": "value 2",
    "1": {"bar": "value 3"}
  }]
}

Would you mind checking this? Thank you