Unable to edit/duplicate/create new mail after upgrading to v3.88.0

Hello,
I’ve just upgraded MailPoet to v3.88.0 but right after that, I can’t get edit an already existing newsletter, or edit one I duplicate, or even create a new one if I choose an already sent one as template…
All I get is this void panel with duplicated tools on the right…
And in my browser console, I can read:

Uncaught (in promise) TypeError: v.Radio is undefined
    initialize https://mysite.fr/wp-content/plugins/mailpoet/assets/dist/js/newsletter_editor.436f8605.js:2
[...and the remaining error stack...]

and after

Uncaught TypeError: x._contentContainer is undefined
    getBody https://mysite.fr/wp-content/plugins/mailpoet/assets/dist/js/newsletter_editor.436f8605.js:2
[...and the remaining error stack...]

I reverted to v3.87.2 and all is working again.