Bad request - Docusign JS embeded - The form is signed but "sessionEnd" is not triggered

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Hello, did you find a resolution on this? I got the exact same problem in the webform embedding process except:

• when i first render an embedded webform, i can fill it, submit the enveloppe and then sign it, all events are triggered perfectly.
• if i render the form, fill it, submit the enveloppe, then close the window and rerender the same form instance with a different instance token: the form opens on the enveloppe signing process directly, so far so good, but when I sign it, the sessionEnd event isn’t fired, in fact no event is fired at all except for ‘ready’ when the enveloppe is opened.
  
  I’d appreciate any help on the topic. Thanks!