Libertarians are frequently authoritarians. Maybe even overwhelmingly so. What they dont like are restrictions on their controlling impulses.

As a centrist libertarian, I would say the dynamic is better framed in that authoritarians are frequently attracted to libertarianism as a way of cloaking and justifying their true beliefs, to both themselves and others. So called "right" libertarianism is rife with this, as it emphasizes a fallacious axiomatic conception of rights which are to be overtly rejected when the logical preconditions have not been met. This captures essentially all of the Surveillance Valley hucksters claiming to be "libertarians" - rights for me, not for thee.