I have a Duet WiFi v1.01 running firmware 1.19 on my Hypercube Evo.

I had a thermal runaway occur during an autotune last night. Sometime during the heating phase the thermistor detached from the hotend with spectacular results:

I was surprised that the firmware protections didn't disable the hotend. The heater cartridge completed destroyed itself before software protections kicked in. I've worked with Marlin a ton but this is my first go round with Reprap firmware. Did I miss something in configuration that could have caught this before it got out of hand? Marlin has been too touchy on PID tunes at times which is annoying but better than a meltdown like this.