I stand corrected.
I was walking home from work and the wind was quite strong with a temperature of -6° C. While listening to my podcast I suddenly heard the Siri "do-do" activation prompt as if I had activated the voice assistant, which I did not. After a moment my podcast resumed playing. Later while standing on the train platform it happened again. This time there was no wind. A few moments later there was an announcement on the speaker system that I wanted to hear so I put my hand on the right ear-cup to enable the ambient noise pass through, which worked, but when I took my hand away the headphones did not re-enable ANC nor resume playing my podcast. In fact, none of the touch controls worked. Even pressing the hardware power button didn't read the current battery level to me like it usually does, nor did pressing the ANC button cycle it back to ANC mode. Seems like a bug that caused them to lock up - I had to power them off and back on again.
Very very strange.