Bean Leaves being Eaten

I have 4 raised beds with vegetables in my garden. In one of my raised beds where I have started to grow beans I’ve noticed that the leaves are being eaten by something. I have protected against slugs with pellets and have checked for insects but cannot see any. The bed beside this has some beets and chard and something is also eating these leaves although not as bad. The other raised beds contain beets, peas, rocket, broccoli and spinach and have no problems. I’ve attached some photos that may help identification.