Annoyed with friend's behaviour on playdates

Hey ladies, my partner and I plan playdates with another couple and their toddler. We get along well with them, we're from different cultures so there are some differences but it's all acceptable and understood. The playdates are usually outdoors. So since the beginning something I've noticed is that they hardly pack food for their toddler, whereas, I always stock up on food. Initially I would always get extra for their child too. Even though they never got anything for my LO. I didn't mind at all until one day their toddler who is a bigger kid ended up eating even my LO's share and his parents said nothing even after witnessing it. So I decided, that's it I'm just getting food for my LO going forward. So at a recent playdate, as always they don't get any food and their toddler had a meltdown because he was hungry. I felt sorry and only shared some extra snacks but it wasn't enough and the meltdown continued. I'm feeling SO mad, because I shouldn't be the one feeling guilty or awkward about this. We both families are financially well off, it's not about that, maybe it's a planning issue they have, Idk! We're new here and it's important for us to have friends we can hangout as a family. As people, they're kind and helpful, but this is a strange behaviour. Should I just continue not getting food and they will get it, hopefully? But I feel bad for the other kid, ughh!!!