Overfetching problem when querying related entities and using intermediary projections

Following https://github.com/ChilliCream/hotchocolate/issues/2365#issuecomment-697727508
I have Book and Author domain classes + BookDto and AuthorDto classes, I want to expose an IQueryable<BookDto> for the books field on my query root type.
So here is the GetBooks method on the Query class: It simply projects Book into BookDto and returns an IQueryable<BookDto> so that Hot Chocolate could then do its magic on it.

[UseSelection]
public IQueryable<BookDto> GetBooks([Service]AppDbContext dbContext)
{
    return dbContext.Books.Select(book => new BookDto
    {
        Name = book.Name,
        ...
        Author = new AuthorDto
        {
            Id = book.Author.Id,
            Name = book.Author.Name,
        }
    });
}

Now, when you run the following query:

{
  books {
    name
    author {
      name
    }
  }
}

You would probably expect the following SQL to ultimately get generated:

SELECT [b].[Name], [a].[Name]
      FROM [Books] AS [b]
      INNER JOIN [Authors] AS [a] ON [b].[AuthorId] = [a].[Id]

However, instead, Hot Chocolate causes this one to get generated by EF Core:

SELECT [b].[Name], [a].[Id], [a].[Name], [a].[Age]
      FROM [Books] AS [b]
      INNER JOIN [Authors] AS [a] ON [b].[AuthorId] = [a].[Id]

Which retrieves all the fields on the author (including Age and Id in this case), even though the query requested only the Name.

At first, I thought this must be an EF Core issue, but then I executed the following code:

var queryableDto = dbContext.Books.Select(book => new BookDto
{
    Name = book.Name,
    Author = new AuthorDto
    {
        Id = book.Author.Id,
        Name = book.Author.Name,
        Age = book.Author.Age
    }
});
// The code that you would expect Hot Chocolate will generate for the above GraphQL query:
queryableDto.Select(bDto => new
{
    Name = bDto.Name,
    Author = new
    {
        Name = bDto.Author.Name,
    }
}).ToList();

And I realized it works as expected, and generates the following SQL which only selects the requested column (author name in this case):

SELECT [b].[Name], [a].[Name]
      FROM [Books] AS [b]
      INNER JOIN [Authors] AS [a] ON [b].[AuthorId] = [a].[Id]

Therefore, this must be related to Hot Chocolate, I believe.
This is really a serious problem for situations like mine when we don't want to expose IQueryable<TheEntityFrameworkModelClass> but rather a different type.

I'm using Hot Chocolate version 10.5.2
And I've tried this with both EF Core version 3.1.8 and 5.0.0 RC.