[TEST] Inverse of doesn't work when associations eager load other associations

Using includes when loading an association that has an inverse_of causes the inverse_of not to work.

p = Project.find(1)
pi = p.project_items
pi[0].project # Doesn't perform a query

p = Project.find(1)
pi = p.project_items.includes(:image)
pi[0].project # Performs a query

I've attached a failing test case for Rails master.