It did the thing I hate, which is a cliffhanger climax, and instead of picking up the thread where it left off and providing resolution/denouement, it just sort of ... resets?

The gold standard, IMO is something like the TNG episodes "The Best of Both Worlds" pt 1 and 2 -- an end-of-season cliffhanger that rewards you returning to the show by telling you what happens next!

I think the lacuna here is meant to add to the tension and mystery, but I agree that the new season has started off frustratingly slow. You gotta wrap up stuff to move forward with a plot, otherwise it's all just treading water for the sake of atmosphere.