Well, that darn line exists everywhere, right? Any spec where 1.33 is the minimum allowed, is 1.32 really not gonna work? How about 1.329? Maybe, maybe no one would notice, maybe it depends on other tolerance stack-ups whether it would or not.
In the case of a Cpk, I doubt it would matter from a practical standpoint, but practicality may not be the issue.
It always sucks to be near the edge of a spec.