It's the job of confd and middleware to prevent this described situation.
If a user can configure the ASG so that the changes are not applied
and a reboot is needed to let the ASG work again this is definitely a bug.

Are you able to trigger such a situation?
If yes please describe what you did and attach following files.
/tmp/confd-debug.log
/tmp/mdwdebug.log
/var/log/confd.log
/var/log/mdw.log

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