Entity Framework Core 6 Include() not select data from related table

When I use .Include() in my code, it is not working as expected.

var query = (from t in db.Table.Include(t => t.ChildTable) 
             select t).ToList();

When get query string I have only one query to dbo.Table. I have created a foreign key and in C# file I have property

public virtual ICollection<ChildTable> ChildTable { get; set; }