turbo-rails: Can't load turbo-rails without Action Cable starting in Rails 7.1.2

I’m not sure whether to report this bug here, or in Rails. Let me know if I should move it.

With today’s release of Rails 7.1.2, it is no longer possible to use turbo-rails without Action Cable. I get the following error when eager loading is enabled:

NameError: uninitialized constant ActionCable (NameError)

class Turbo::StreamsChannel < ActionCable::Channel::Base
                                                  ^^^^^^
Did you mean?  Rational
/Users/mbrictson/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/turbo-rails-1.5.0/app/channels/turbo/streams_channel.rb:34:in `<main>'

This check in the turbo-rails engine is supposed to automatically remove app/channels from the eager-load paths when Action Cable is not present:

https://github.com/hotwired/turbo-rails/blob/e44b6a98a77a0a2cc927f986a67517d73c4c9246/lib/turbo/engine.rb#L18-L20

However, starting with Rails 7.1.2, this technique apparently no longer works.

There were changes in Rails 7.1.2 regarding auto/eager loading of paths in engines (see https://github.com/rails/rails/pull/49636), so this could be a new bug Rails, or it could mean that turbo-rails needs to be changed to accommodate the new behavior.

Edit: I confirmed that rolling back https://github.com/rails/rails/pull/49636 fixes the problem.