@JasonL Thanks for the update, and for getting this fixed.
One follow-up: now that _copy is auto-appended, the resulting code can
exceed the 12-character limit, and in that case the clone still can't be
saved. For example, a code that's already 8+ characters will go over the
limit once _copy is added.
Ideally, the code field should be editable during the clone step itself,
so the user can set a valid, unique code up front rather than relying on
an auto-generated suffix that may already break the length limit.