Not sure if it still exists, but a few years ago there was a bug that if an alarm was created using Siri, it wouldn’t make a noise at the set time. It would show as a switched on in the clock app, but wouldn’t actually do the one thing it was meant to do.
Accidentally took a wrong turn and drove over this once and had to cop a toll despite turning back around afterwards. Was well worth it for the experience though!
My therapist mentioned the same thing to me recently so I suppose it is worth investigating further.
I had never considered it before that, probably due to lack of understanding of what ADD/ADHD is (when I was growing up the stereotype was high energy kids bouncing off the walls and unable to sit still and focus in class, whereas I was low energy, introverted, and had always done well in school and work so it was never a thought).