This is the key distinction: -proven- fundamental is very different from -considered- fundamental.
Overturning Heisenberg's Uncertainty Principle would shatter physics as we know it.
Overturning a misconception is far more mundane.
I mean, sure, some laws like Heisenberg's Uncertainty Principle can be proven mathematically from the axioms of a theory, but how exactly would that make it more fundamental than a law that is considered an axiom itself?
Certain things have an immense amount of supporting data.
PS FWIW Heisenberg's Uncertainty Principle isn't understood now as it was then - that principle as it was has been overturned.
Also, this does not invalidate the previous law necessarily; we still use Newton's laws because its assumptions hold under most circumstances.