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I'm embarrassed to admit that I was dismissing that error as trivial and unrelated. I guess I need to raise my debugging game, because I was unable to discern that it was stopping other scripts from running.

It was a script belonging to the parent theme, calling a css property on an undefined object. I don't know whether the object-not-being-defined is a new phenomenon with the upgrades, or what, but it doesn't really matter now. I wrapped the code in an if statement checking whether the object exists, and now the problem is solved.

Thanks so much for the catch!