Tried a few different things so far. Seems like it's only the Beetle core that doesn't like the scene transition in Chamber of Fear, the one after Ashley says "This is a big one!". Works fine in the base game, but that room + Zenith causes the emulator to hang. No idea what might be causing this, since other emulators don't have a problem with it. Additionally, if I get past that transition on the PCSX core, save, then swap to Beetle, going back to that room after the transition has occurred will still cause a hang. Not a big deal, since I can just switch cores if I ever need to be in that room. Just thought it was interesting.