Sorry, but I have seen a real tendency among self-defined libertarians to want government programs...but only the ones they want. And drugs do seem to be the defining issue for libertarians.
Again, this may not be the official position of the Libertarian Party or even a respectable current within it. But it’s sure one I’ve seen a lot among people I know who call themselves libertarians.
I’ve known Libertarians for over 30 years and I would say that you are spot on.