The safety capacitance is as high as 1μF, which is obviously X capacitance (Y capacitance 1μF is fatal). If the X capacitor is short-circuited, it should be an explosion, but if it is open, there should be no obvious phenomenon (at least in the user's view), so this fault has nothing to do with the X capacitor, and it should be baked by a nearby resistor.

I'm not sure about the purpose of that resistor. I suggest you draw a picture of the nearby circuit. The burning loss of the resistor is not necessarily caused by the fault of the resistor itself, but may also be caused by other circuit faults. In short, there should be a circuit diagram to analyze the cause of the failure.