`or` not working -- relation must be structurally compatible

If I try to execute a state's scope inside an or statement, it doesn't work properly.

Model.any_non_state_scope.or(Model.state_scope)

(For instance, Todo.where(description: value).or(Todo.unchecked) if unchecked is a state)

That causes this error:

*** ArgumentError Exception: Relation passed to #or must be structurally compatible. Incompatible values: [:references]

I can fix this by using a state scope outside of the or as well:

Model.any_state_scope.or(Model.state_scope)

(For instance, Todo.checked.or(Todo.unchecked) if checked and unchecked are states)

But that's obviously not ideal.

This also DOES NOT work like this:

Model.where(state: any_state).or(Model.state_scope)

It has to directly use the aasm scope methods or it's seen as incompatible.

Reproduce the two Model#or examples from the issue and inspect the AASM state-scope integration with Rails relations, especially the structural compatibility and references values. Done means a relation such as Todo.where(description: value).or(Todo.unchecked) works without the incompatibility error while the existing state-scope examples continue to work.