Turns out the issue is even worse than we thought. We can't edit ANY zones that start with a numeral; the latest 'upgrade' removed them from the /etc/userdomains file, so you have to add them back manually. cPanel tech opened Case CPANEL-36573.
Apparently you can add your name to be informed when there's a fix:
Apparently you can add your name to be informed when there's a fix:
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