When you have the grace effect, it still shows your body temperature changing and if its intense enough you will get the visual effects like camera movement and blurring. It would be better if the grace effect kept body temperature neutral and unaffected by heat/cold effects.

I am using the latest release version which is 2.3.12. I see that there are a bunch of beta versions so it's great if it's been changed for future release

I forget which version I changed this in, but the visual effects don't happen in newer versions if you're in the grace period. I still think your body temperature should be allowed to change, though, since it gives new players a chance to get a feel for the temperature system before the consequences set in.