Bug: Deep association search (two levels) not working in Ransack 4.3.0

[souravforsycamore]

Ransack version: 4.3.0
Rails version: 7.2.2.1
Ruby version: 3.3.7

🧩 Problem
Searching through a two-level nested association is not working, even with ransackable_associations and ransackable_attributes explicitly defined as per the Ransack 4.3.0 documentation.

✅ Expected Behavior
Given the following model structure:

class Comment < ApplicationRecord
  belongs_to :post
end

class Post < ApplicationRecord
  belongs_to :user
end

class User < ApplicationRecord
  # has attribute :email
end

I expect this query to work:

Comment.ransack(post_user_email_cont: "john@example.com").result
...and generate SQL similar to:

SELECT "comments".* FROM "comments"
INNER JOIN "posts" ON "posts"."id" = "comments"."post_id"
INNER JOIN "users" ON "users"."id" = "posts"."user_id"
WHERE "users"."email" ILIKE '%john@example.com%'

❌ Actual Behavior
The search query returns no results, or an error, even when:

All associations are valid