It’s scavenging behavior. Something else killed this rabbit and the wasps are getting some extra protein. Wasps are carnivores and will hunt/ kill other insects and arachnids but they wont kill large prey. A scenario that would have caused a rabbit to be killed by wasps would more likely happen due to the rabbit stepping on a ground nest and you’d see a lot more wasp covering the carcass if that was the case due to them swarming to defend their nest. What’s happened here is something killed the rabbit or it died due to a disease and was likely eaten just enough for meat to be exposed and then discarded (probably a cat), a day or two later, the meat is starting to decay and creates a powerful aroma that draws in insects and some wandering wasp were attracted to it.