MongoDB Shell deleteMany() function is not working

Question

I have to delete all the data called owner.login. It means in json data, there are one more Object called owner.

So I tried in MongoSH Beta(MongoDB Compasss) and Mongo Shell with this query but it returns this message and it doesn't removed.

{ acknowledged: 1, deletedCount: 0 }

The json data structure looks like this

So I have to delete all the data that owner.login called 'mojombo'.

So I use this query db.repos.deleteMany({owner.login:'mojombo'});

I don't know why the function doesn't work. This command worked well in the Filter function of MongoDB Compass.