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As you see in the picture, the heater turn on with 100% power (without PID) until it reach some gap say 5 degree C from setpoint then the PID start. I not sure why the heater power decrese to zero afterward, (May be PID start with I-term equals to 0) but it result as false thermaal runaway alarm sometime. I tune my PID value with Marlin auto tune. In this picture I turn P-coefficient up a bit to make it heat up faster to avoid thermal runaway. Is that consider as bug? If my theory was right,I think P-term shoundn't be zero near the setpoint. How to prevent these situation (temp drop/thermal runaway false alarm)

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