That's one helluva question, Anon.
If knowledge is learning-from-our mistakes (also see "objective philosophy") then knowledge is "temporary" so
that a society can discard the old mistakes for better, newer ones.
In this way new better knowledge emerges - sometimes completely disguised cutting edge stuff which is typically discovered; or undisguised law- type new knowledge which is not discovered but made, crafted and constructed.
1. We have discovered Climate change, which was disguised as within "the great Industrial revolution" and the "oil booms" et al.
We may say that it was discovered and THINLY disguised...but here we needn't "split hairs" and we can quite
naturally describe it as the first.
2. "Universal Propositions" are all undisguised law-type knowledge, crafted and constructed I believe so that science and later philosophy could be better explained. Recently I understand that there is a new controversy about whether these undisguised constructed propositions have any value, any BETTER understanding as knowledge.
Well now... if I wanted say to pass an important exam in science rather than say understand some far flung but irreversible truth within Philosophy then it is likely that in the first case (important science exam) we must agree (and see) that Universal Propositions are better-understandable-as-knowledge.
Whilst in the second case -in newer Philosophy- we can agree that Universal Propositions are an undisguised crutch for scientific knowledge specifically - without the added understanding which reaches into other knowledge areas.
3. A third example of (temporary) knowledge I have previously outlined as "Why the Ancient Greeks failed at Philosophy ?"
Basically they failed because they didn't learn from THEIR mistakes of slavery and male sexism...choosing to otherwise do
wordy and math stuff which may have been a LOT easier but which we now can see was hardly comparable knowledge
- hardly temporary knowledge nor permanent knowledge. And if you think that they did - then YOU are correct
and I am wrong (not vice versa I may add !).
Whilst this is a faithfully described temporary account, nevertheless it is my interpretation^ (thus may or may not be a better path to that of the more reasonably permanent kind).
My 3 examples describing temporary knowledge as permanent*.
* AS CRITICALLY permanent.