Stripe element not loaded on additional payment form in a popup when stripe is the default processor

1. Turn on popups at admin - customize - display prefs.
2. Make stripe the default processor.
3. Make a pending contribution (it doesn't have to be pending it just makes it more realistic). Can do this in the backend it doesn't matter.
4. From the contribution tab on the contact or from the contribution dashboard or find contributions, click on view to open the contribution in a popup.
5. Click on submit credit card payment.
6. The stripe widget doesn't load.

It appears to be because nothing is triggering a call to civicrm/payment/form. If I manually run CRM.$('#payment_processor_id').change() in the console, or switch the dropdown to another pp and then switch it back it works. It also works when popups are turned off, or if I open in a new tab.

This happens as far back as civi 5.65, and at least back to stripe 6.10. And in a stock (drupal 7) install with civi master and the latest stripe et al.

I'm not clear on why it's only a problem with popups since it's the same form (civicrm/payment - the AdditionalPayment form).