2 usability questions re: turbo and forms

Ran into a bit of a problem listening to submit-start and submit-end doing something like so:

document.addEventListener('turbo:submit-start', () => {
  Turbo.navigator.delegate.adapter.showProgressBar();
})

document.addEventListener('turbo:submit-end', (e) => {
  Turbo.navigator.delegate.adapter.progressBar.hide();
  if (e.detail.success === false) {
    e.target.previousElementSibling.scrollIntoView(true) 
  }
})

In particular, turbo:submit-end doesn’t seem to reliably fire on Safari 14.0.3 for me, despite the fetch request happening. It seems happy in Chrome. I do have rails_ujs installed, but disabled on forms.

If I wrap the form in a turbo frame, the event reliably fires but Rails is giving me a 302 back, not a 303, so the success condition doesn’t redirect…

This is 7.0.0-beta.3 and turbo-rails 0.5.7.