it is a regression. the user space application also would silently fail, it is a chain of oversights.
also having the encryption keys in memory does not mean you can extract them, it is more of unnecessarily letting it there indefinitely, not having it where it shouldn't be.
The whole point of luksSuspend is to not have the encryption keys in memory, as that actually does mean they could be extracted by an attacker who has taken the hardware.
