ActiveRecord custom after callback current_scope is not nil

I have a model (let's call it Blog). It looks like:

class Blog < ApplicationRecord
  belongs_to :author

  def self.foo_all
    all.each(&:bar)
  end

  def bar
    author.baz
  end
end

Now, the problem I'm having is that when author.blogs.foo_all method is called, it seems that the Blog class has a current_scope! This means that when inside the author.baz method, any query on Blog has the author as a scope on the query (WHERE authors.id == 123)!

Using an example where

• blog.id == 123
• author.id == 456

this is what happens:

Class Author < ApplicationRecord
  has_many :blogs

  def baz
    id # 456
    blogs.count # "SELECT count(*) FROM blogs WHERE blogs.author_id == 456"
    Blog.count # "SELECT count(*) FROM blogs WHERE blogs.author_id == 456"
    Blog.current_scope # "[Blog id: 123, author_id: 456]"
  end
end

Yes, I can work around this why explicitly removing that scope, but it's SO unexpected! In what world does Blog.count not perform an unscoped query?!

Note: I do not use a default_scope anywhere.

Rails: 6.1.3.2

Copy of code with rspec test that replicates the problem https://github.com/hrdwdmrbl/StockOverflow69020511