Possible bug: Meteor.call callback is not being executed when object id is of type MongoID

My data _id schema is of type MongoID instead of the default: see [idGeneration Meteor Docs](https://docs.meteor.com/api/collections.html).

This caused all my Meteor method that handled fetching of this collection to never execute its callback in `Meteor.call(callback)`

My fix was this: (server side)
```javascript
Meteor.methods({
getNews: function(newsId){
check(newsId, String);
let news = News.findOne(new Mongo.ObjectID(newsId));
news._id = news._id.str;
return news;
}
});
```
Before returning the news object, I had to change its id back to string.
With this my callback `Meteor.call(callback)` was executed.

I'm not completely sure, but I think it's related to this package, or Meteor in general.
Must investigate further.
Any help appreciated.