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After trying as many suggestions as I could, it seems the one that did the trick was replacing the thermistor entirely. Seems I must have broken it somehow, though the glass bulb and wires were still intact from what I could tell.
Glass bead thermistors have very fragile wires and sometimes you can’t see a break that has occured. I replaced mine with a cartridge as fast as possible, but good on you for finding and solving the problem.