Issue with "ticket.groupChanged" on New Email Page

Hello,

I am writing to report a bug concerning the “ticket.groupChanged” event handler, which is malfunctioning on the new email page (location: new_email_background). When initially invoked, it correctly returns the new group; however, subsequent changes result in a return value of NaN.

This issue does not occur in the ticket_sidebar location, where the event functions as expected. For your reference, I have attached a video that demonstrates the bug in action:
Vidyard Recording?

I have also attached the relevant code for review.
new_email_page_issue.zip (30.1 KB)