I think there's nothing wrong with this. (Though of course I'm biased.) The intermittent fasting seems to benefit my concentration and energy, even if the fasting happens to be unintentional and due to distraction or laziness. The only externality is if you end up eating a lot right before sleeping, which tends to impact my sleep and digestion. As long as you avoid that and are getting enough calories and nutrition, I don't see the issue.